Definição e significado de filling-station

A filling station, fueling station, garage, gasbar (Canada), gas station (United States and Canada), petrol pump (India), petrol garage, petrol kiosk (Singapore), petrol station (United Kingdom, Ireland and Hong Kong), service station, or servo (Australia), is a facility which sells fuel and usually lubricants for motor vehicles. The most common fuels sold today are gasoline (gasoline or gas in the U.S. and Canada, typically petrol elsewhere), diesel fuel, and electric energy. Filling stations that sell only electric energy are also known as charging stations.

Fuel dispensers are used to pump petrol/gasoline, diesel, CNG, CGH2, HCNG, LPG, LH2, ethanol fuel, biofuels like biodiesel, kerosene, or other types of fuel into vehicles and calculate the financial cost of the fuel transferred to the vehicle. Fuel dispensers are also known as bowsers (in some parts of Australia),^[1] petrol pumps (in most Commonwealth countries) or gas pumps (in North America).

Many filling stations also combine small convenience stores, and some also sell propane or butane and have added shops to their primary business. Conversely, some chain stores, such as supermarkets, discount superstores, warehouse clubs, or traditional convenience stores, have provided filling stations on the premises.

Contents 1 Terminology 2 Number of petrol stations worldwide 3 History of filling stations 3.1 United States 4 Design and function 4.1 Underground filling stations 5 Marketing 5.1 United States and Canada 5.1.1 Premium brands 5.1.2 Discount brands 5.2 State controlled stations 5.3 Global and local branding 6 Payment methods 6.1 Canada 6.2 Ireland 6.3 United Kingdom 6.4 United States 7 Types of service 7.1 United States and Canada 8 Other goods and services commonly available 9 Price at the pump 9.1 Fuel prices in Europe 9.2 Fuel prices in North America 9.3 Fuel prices elsewhere 10 Service stations 11 Octane 12 Differences in fuel dispensers 13 Risk of accidental ignition 14 See also 15 References 16 Further reading 17 External links

  Terminology

The term "gas station" is mostly used in the US, Canada and the English-speaking Caribbean, where the fuel is known as "gasoline" or "gas" as in "gas pump". In some regions of Canada, the term "gas bar" is used. Elsewhere in the English-speaking world, mainly in the Commonwealth, the fuel is known as "petrol", and the term "petrol station" or "petrol pump" is used. In the United Kingdom and South Africa "garage" is still commonly used, even though the petrol station may have no service/maintenance facilities which would justify this description. Similarly, in Australia, the term "service station" ("servo") describes any petrol station. In Japanese English, it is called a "gasoline stand". In Indian English, it is called a petrol pump or a petrol bunk. In some regions of America and Australia, many filling stations have a mechanic on duty, but this is uncommon in other parts of the world.

  Number of petrol stations worldwide

• As of 2010, there were 8,787 petrol stations in the U.K, down from about 18,000 in 1992.^[2]
• The USA had 128,887 filling stations (gas stations) in 2007 according to the Census.^[3]
• In Canada, the number is on the decline. As of December 2008, 12,684 were in operation, significantly down from about 20,000 stations recorded in 1989^[4]
• In Japan, the number is on the decline to about 50,000.^{[citation needed]}
• In Germany, the number dropped down to 15,000 in 2010.^{[citation needed]}
• In China, according to different reports, the number (year 2009) is about 95,000 to 97,000.^[5][6]
• India – 35,068 (2009^[7])

  History of filling stations

The first places that sold gasoline/petrol were pharmacies, as a side business. The first gas/petrol station was the city pharmacy in Wiesloch, Germany, where Bertha Benz refilled the tank of the first automobile on its maiden trip from Mannheim to Pforzheim and back in 1888. Since 2008 the Bertha Benz Memorial Route commemorates this event.^[8][9]

  United States

The increase in automobile ownership after Henry Ford started to sell automobiles that the middle class could afford resulted in a greater demand for filling stations. The world's first purpose built gas station was constructed in St. Louis, Missouri in 1905 at 420 S. Theresa Avenue. The second gas station was constructed in 1907 by Standard Oil of California (now Chevron) in Seattle, Washington at what is now Pier 32. Reighard's gas station in Altoona, Pennsylvania claims that it dates from 1909 and is the oldest existing gas station in the United States. Early on, they were known to motorists as "filling stations". The first "drive-in" filling station, Gulf Refining Company opened to the motoring public in Pittsburgh in 1913.^[10] Prior to this, automobile drivers pulled into almost any general or hardware store, or even blacksmith shops in order to fill up their tanks. On its first day, the station sold 30 gallons of gasoline at 27 cents per gallon. This was also the first architect-designed station and the first to distribute free road maps.^[11]

  Design and function

Most filling stations are built in a similar manner, with most of the fueling installation underground, pump machines in the forecourt and a point of service inside a building. Single or multiple fuel tanks are usually deployed underground. Local regulations and environmental concerns may require a different method, with some stations storing their fuel in container tanks, entrenched surface tanks or unprotected fuel tanks deployed on the surface. Fuel is usually offloaded from a tanker truck into the tanks through a separate valve, located on the filling station's perimeter. Fuel from the tanks travels to the dispenser pumps through underground pipes. For every fuel tank, direct access must be available at all times. Most tanks can be accessed through a service canal directly from the forecourt.

Older stations tend to use a separate pipe for every kind of available fuel and for every dispenser. Newer stations may employ a single pipe for every dispenser. This pipe houses a number of smaller pipes for the individual fuel types. Fuel tanks, dispenser and nozzles used to fill car tanks employ vapor recovery systems, which prevents releases of vapor into the atmosphere with a system of pipes. The exhausts are placed as high as possible. A vapor recovery system may be employed at the exhaust pipe. This system collects the vapors, liquifies them and releases them back into the lowest grade fuel tank available.

The forecourt is the part of a filling station where vehicles are refueled. Fuel dispensers are placed on concrete plinths, as a precautionary measure. Additional elements may be employed, including metal barriers. The area around the fuel dispensers must have a drainage system. Since fuel sometimes spills on the ground, as little of it as possible should penetrate the soil. Any liquids present on the forecourt will flow into a channel drain before it enters a petrol interceptor which is designed to capture any hydrocarbon pollutants and filter these from rainwater which may then proceed to a foul sewer, stormwater drain or to ground.

If a filling station allows customers to pay at the register, the data from the dispensers may be transmitted via RS232 or Ethernet to the point of sale, usually inside the filling station's building, and fed into the station's cash register operating system. The cash register system gives a limited control over the fuel dispenser, and is usually limited to allowing the clerks to turn the pumps on and off. A separate system is used to monitor the fuel tank's status and quantities of fuel. With sensors directly in the fuel tank, the data is fed to a terminal in the back room, where it can be downloaded or printed out. Sometimes this method is bypassed, with the fuel tank data transmitted directly into an external database.

  Underground filling stations

The underground modular filling station is a construction model for filling stations that was developed and patented by U-Cont Oy Ltd in Finland in 1993. Afterwards the same system was used in Florida, USA. Above-ground modular filling stations were built in the 1980s in eastern Europe and especially in Soviet Union, but they were not built in other parts of Europe due to the stations' lack of safety in case of fire.

The construction model for underground modular filling station makes the installation time shorter, designing easier and manufacturing less expensive. As a proof of the model's installation speed an unofficial world record of filling station installation was made by U-Cont Oy Ltd when a modular filling station was built in Helsinki, Finland in less than three days, including groundwork. The safety of modular filling stations has been tested in a filling station simulator, in Kuopio, Finland. These tests have included for instance burning cars and explosions in the station simulator.^[12][13]

  Marketing

  United States and Canada

In the United States and Canada, there are generally two marketing types of filling stations: premium brands and discount brands.

  Premium brands

Filling stations with premium brands sell well-recognized and often international brands of gasoline, including Exxon and its Esso brand, Citgo, Hess, Chevron, Mobil, Shell, Sinclair, Sunoco (US), BP, Valero and Texaco. Non-international premium brands include Petrobras, Petro-Canada (owned by Suncor Energy Canada), and Pemex. Premium brand stations accept credit cards, often issue their own company cards (a.k.a. fuel cards) and may charge higher prices. Many of them have fully automated pay-at-the-pump facilities. Premium gas stations tend to be highly visible from highway and freeway exits, utilizing tall signs to display their brand logos.

  Discount brands

Discount brands are often smaller, regional chains or independent stations, offering lower prices on gasoline. Most purchase wholesale commodity gasoline from independent suppliers or from the major petroleum companies. Lower-priced gas stations are also found at some supermarkets (Albertsons, Kroger, Giant, Weis Markets, Safeway, Vons, Meijer, Loblaws/Real Canadian Superstore, Canadian Tire, and Giant Eagle), convenience stores (7-Eleven, Cumberland Farms, Road Ranger, Sheetz and Wawa), discount stores (Wal-Mart) and warehouse clubs (Costco, Sam's Club, and BJ's Wholesale Club). At some stations (such as Vons, Costco, BJ's Wholesale Club, or Sam's Club), consumers are required to hold a special membership card in order to be eligible for the discounted price, or pay only with the chain's cash card or a credit card issuer exclusive to that chain. In some areas, such as New Jersey, this practice is illegal, and stations are required to sell to all at the same price. Some convenience stores, such as 7-Eleven and Circle K, have co-branded their stations with one of the premium brands. After the Gulf Oil company was sold to Chevron, northeastern retail units were sold off as a chain, with Cumberland Farms controlling the remaining Gulf Oil outlets in the United States.

  State controlled stations

Some countries have only one brand of petrol station. In Mexico, where the oil industry is state-owned and prices are regulated, the country's main operator of petrol stations is Pemex. In Malaysia Shell is the dominant player by number of stations with government-owned Petronas coming in second. In Indonesia the dominant player by number of stations is the government-owned Pertamina, although other companies such as Total and Shell are increasingly found in big cities such as the capital Jakarta or Surabaya.^[14]

  Global and local branding

Some companies, such as Shell, use their brand worldwide, however, Chevron uses its inherited brand Caltex in Asia Pacific, Australia and Africa, and its Texaco brand in Europe and Latin America. ExxonMobil uses its Exxon and Mobil brands but is still known as Esso (the forerunner company name, Standard Oil - S. O.) in many places. In Brazil, the main operator is Petrobras but Esso, Ipiranga, Texaco and Shell are also present. In the United Kingdom, the two largest are BP and Shell. The "Big Four" supermarket chains, Morrisons, Sainsburys, Asda and Tesco, all operate filling stations, as well as some of the smaller supermarkets such as The Co-operative Group and Waitrose. Indian Oil operates approximately 15,000 petrol stations in India.

  Payment methods

  Canada

In British Columbia, it a legal requirement that customers either pre-pay for the fuel or pay at the pump. The law is called "Grant's Law"^[15] and is intended to prevent "gas-and-dash" crimes. In other provinces payment after filling is permitted and widely available, though some stations may require either a prepayment or a payment at the pump at night hours.

  Ireland

In the Republic of Ireland, most petrol stations allow customers to pump fuel before settling the bill. Some petrol stations have pay-at-the-pump facilities.

  United Kingdom

Most stations require the customer to pump the fuel, then pay in the shop. In some cases, often when a station has been having problems with fuel theft, they may temporarily require advance payment.

A large majority of stations allow customers to pay with a chip and pin payment card. Many have a pay at the pump system, where customers can enter their Pin number prior to filling.

  United States

Pre-payment, most commonly at the pump, is the norm in the U.S. Customer may typically pay either at the pump or inside the gas stations shop/pay station. Modern gas stations have pay-at-the-pump capabilities — in most cases credit, debit, ATM cards, fuel cards and fleet cards are accepted. Occasionally a station will have a pay-at-the-pump-only period per day, when attendants are not present, often at night, and some stations are pay-at-the-pump-only 24 hours a day.

  Types of service

Filling stations typically offer one of three types of service to their customers: full service, minimum service or self service.

Full service

An attendant (gas jockey) operates the pumps, often wipes the windshield, and sometimes checks the vehicle's oil level and tire pressure, then collects payment (and perhaps a small tip).

Minimum service

An attendant operates the pumps. This is often required due to legislation that prohibits customers from operating the pumps.

Self service

The customer performs all required service. Signs informing the customer of filling procedures and cautions are displayed on each pump.

  United States and Canada

In the past, filling stations in the United States offered a choice between full service and self service. Until the 1970s, full service was the norm, and self service was rare.

The first self service station in Canada was located in Winnipeg, Manitoba, in 1949 and was operated by independent Henderson Thriftway Petroleum, run by Bill Henderson.^[16] The first self service gas station in the United States was in Los Angeles, opened in 1947 by Frank Ulrich.

Today, few stations advertise full service. Full service stations are more common in wealthy and upscale areas. The cost of full service is usually assessed as a fixed amount per U.S. gallon.

All stations in New Jersey and Oregon offer only full service and mini service; attendants are required to pump gas because customers are barred by statutes in both states from pumping their own gas. New Jersey banned self-service gasoline in 1949 after lobbying by service station owners. Proponents of the ban cite safety and jobs as reasons to keep the ban.^[17] Likewise, the 1951 Oregon statute banning self-service gasoline lists 17 different justifications, including the flammability of gas, the risk of crime from customers leaving their car, the toxic fumes emitted by gasoline, and the jobs created by requiring mini service.^[18] In addition, the ban on self-service gasoline is seen as part of Oregonian culture. One commentator noted, "The joke is when babies are born in Oregon, the doctor slaps their bottom, ‘No self-serve and no sales tax’ [. . .] It's as much a cultural issue as an economic issue. It's a way of life."^[19] In 1982 Oregon voters rejected a ballot measure sponsored by the service station owners, which would have legalized self-service gas.^[20]

The town of Huntington, New York bans gasoline self-service to save jobs. The ban came into effect in the early 1970s during a recession.

The constitutionality of the self-service bans has been disputed. The Oregon statute was brought into court in 1989 by ARCO, and the New Jersey statute was challenged in court in 1950 by a small independent service station, Rein Motors. Both failed. New Jersey governor Jon Corzine sought to lift the ban on self service for New Jersey. He asserted that it would be able to lower gas prices, but some New Jerseyans argued that it could cause drawbacks, especially unemployment.

In New Jersey and Oregon, it is legal for customers to pump their own diesel (although not every station permits diesel customers to do so; truck stops typically do).^{[citation needed]} In Oregon, "certain nonretail" customers may also pump their own fuel.^[21]

  Other goods and services commonly available

Many stations provide toilet facilities for customer use, as well as squeegees and paper towels for customers to clean their vehicle's windows. Discount stations may not provide these amenities in some countries.

Stations typically have an air compressor (some with a built-in or provided handheld tire-pressure gauge) to inflate tires and a hose to add water to vehicle radiators. Some air compressor machines are free of charge, while others charge a small fee to use (typically 50 cents to a dollar in North America). In many U.S. states, state law requires that paying customers must be provided with free air compressor service. In most cases, a token provided by the attendant is used in lieu of coins.

Many filling stations have integrated convenience stores which sell food, beverages, and often cigarettes, lottery tickets, motor oil, and auto parts. Prices for these items tend to be higher than they would be at a supermarket or discount store.

Many stations, particularly in the United States, have a fast food outlet inside. These are usually "express" versions with limited seating and limited menus, though some may be regular-sized and have spacious seating. Larger restaurants are common at truck stops and toll road service plazas.

In some U.S. states, beer, wine, and liquor are sold in gas stations, though this practice varies according to state law (see Alcohol laws of the United States by state). Nevada also allows the operation of slot and video poker machines without time restrictions.

Vacuum cleaners, often coin-operated, are a common amenity to allow the cleaning of vehicle interiors, either by the customer or by an attendant.

Some stations are equipped with car washes. Car washes are sometimes offered free of charge or at a discounted price with a certain amount of gas purchased. Conversely, some car washes operate filling stations to supplement their businesses.

Many service stations provided free maps to customers, but this is no longer the practice.

  Price at the pump

  Fuel prices in Europe

In European Union (EU) member states, petrol (gas) prices are much higher than in North America due to higher fuel excise or taxation, although the base price is also higher than in the U.S. Occasionally, price rises trigger national protests. In the UK a large-scale protest in August and September 2000, known as 'The Fuel Crisis', caused wide-scale havoc not only across the UK, but also in some other EU countries. The British government eventually backed down by indefinitely postponing a planned increase in fuel duty. This was partially reversed during December 2006 when Gordon Brown (UK Chancellor of the Exchequer) raised fuel duty by 1.25 pence per litre.

In much of Europe, including Britain, France and Germany, filling stations operated by large supermarket and hypermarket outlets usually price fuel lower than stand-alone filling stations. In most of mainland Europe, sales tax is lower on diesel fuel than on petrol (gas), and diesel is accordingly the cheaper fuel: in the UK and Switzerland, diesel has no tax advantage and retails at a higher price by quantity than petrol (offset by its higher energy yield).

  Fuel prices in North America

Nearly all filling stations in North America advertise their prices on large signs outside the stations. Some locations have laws requiring such signage.^[22]

In Canada and the United States, federal, state or provincial, and local sales taxes are usually included in the price, although tax details are often posted at the pump and some stations may provide details on sales receipts. Gas taxes are often ring-fenced to fund transportation projects such as the maintenance of existing roads and construction of new ones.

In the United States, the states of California and Hawaii typically have the highest gasoline prices, while the lowest prices are usually found in oil producing states like Oklahoma and Texas. In Canada, prices are typically highest in the provinces of British Columbia and Quebec, and the lowest in the oil-producing province of Alberta. The provinces of Prince Edward Island (PEI), Newfoundland and Labrador, New Brunswick, and Nova Scotia have instituted gasoline price regulation, which is intended to protect small rural gas stations from low profits due to low sales volume.

Individual gas stations in the United States have little if any control over gasoline prices.^{[citation needed]} The wholesale price of gasoline is determined according to area by oil companies which supply the gasoline, and their prices are largely determined by the world markets for oil. Individual gas stations are unlikely to sell gasoline at a loss, and the margin—typically between 7 and 11 cents a U.S. gallon—that they make from gasoline sales is limited by competitive pressures: a gas station which charges more than others will lose customers to them. Most gas stations try to compensate by selling higher-margin food products in their convenience stores.

Even with oil market fluctuations, prices for gasoline in the United States are among the lowest in the industrialized world; this is principally due to lower taxes. While the sales price of gasoline in Europe is more than twice that in the United States, the price of gas excluding taxes is nearly identical in the two areas. Some Canadians and Mexicans in communities close to the U.S. border drive into the United States to purchase cheaper gasoline.

Due to heavy fluctuations of gasoline price in the United States, some gas stations offer their customers the option to buy and store gas for future uses, such as the service provided by First Fuel Bank.

In order to save money, some consumers in Canada and the United States inform each other about low and high prices through the use of gasoline price websites. Such websites allow users to share prices advertised at filling stations with each other by posting them to a central server. Consumers then may check the prices listed in their geographic area in order to select the station with the lowest price available at the time. Some television and radio stations also compile pricing information via viewer and listener reports of pricing or reporter observations and present it as a regular segment of their newscasts, usually before or after traffic reports. These price observations must usually be made by reading the pricing signs outside stations, as many companies do not give their prices by telephone due to competitive concerns. In Canada it is against federal law to provide any gas pricing from a gas station via phone. It is a criminal offence to have written or verbal arrangements with competitors, suppliers or customers for:

• fixing prices and exchanging information on prices or cost (including discounts and rebates),

• limiting or restraining competition unduly,

• engaging in misleading or deceptive practices.

Gas stations must never hold discussions with other competitors regarding pricing policies and methods, terms of sale, costs, allocation of markets or boycotts of our petroleum products.^[23]

  Fuel prices elsewhere

In other energy-importing countries such as Japan, gasoline and petroleum product prices are higher than in the United States because of fuel transportation costs and taxes.

On the other hand, some of the major oil-producing countries such as the Gulf States, Iran, Iraq, and Venezuela provide subsidized fuel at well below world market prices. This practice tends to encourage heavy consumption.

Hong Kong has some of the highest pump prices in the world, but most customers are given discounts as card members.

In Western Australia a programme called Fuelwatch requires most WA filling stations to notify their "tomorrow prices" by 2pm each day; prices are changed at 6am each morning, and must be held for 24 hours. Each afternoon, the prices for the next day are released to the public and the media, allowing consumers to decide when to fill up.

  Service stations

In New Zealand a filling station is often referred to as a service station, garage, or petrol station, even though the filling station may not offer mechanical repairs or assistance with dispensing fuel. Levels of service available include full service, for which assistance in dispensing fuel is offered, as well as offers to check tyre pressure or clean vehicle windscreens. This type of service is becoming uncommon in New Zealand, particularly Auckland. Further south of Auckland, many filling stations offer full service. There is also help service or assisted service, for which customers must request assistance before it is given, and self service, for which no assistance is available.

In the UK, a 'service station' refers to much larger facilities, usually attached to motorways (see rest area) or major truck routes, which provide food outlets, large parking areas, and often other services such as hotels, arcade games, and shops in addition to 24-hour fuel supplies and a higher standard of restrooms. Fuel is typically more expensive from these outlets due to their premium locations. UK service stations do not usually repair automobiles.

In the U.S., a filling station that also offers services such as oil changes and mechanical repairs to automobiles is called a service station. Until the 1970s the vast majority of gas stations were service stations; now only a minority are. This kind of business provided the name for the U.S. comic strip Gasoline Alley, where a number of the characters worked. List of Gas stations. This arrangement occurs on many toll roads and some interstate freeways and is called an oasis, service plaza, or truck stop. In many cases, these centers might have a food court or cafeteria. In the U.S., Pilot Flying J and TravelAmerica are two of the most common full-service chains.

Often, the state government maintains public rest areas directly connected to freeways, but does not rent out space to private businesses, as this is specifically prohibited by law via the Interstate Highway Act of 1956 which created the national Interstate Highway System, except sites on freeways built before January 1, 1960, and toll highways that are self-supporting but have Interstate designation, under a grandfather clause. As a result, such areas often provide only minimal services such as restrooms and vending machines.

Private entrepreneurs develop additional facilities, such as restaurants, gas stations, and motels in clusters on private land adjacent to major interchanges. Because these facilities are not directly connected to the freeway, they usually have huge signs on poles several hundred feet high, visible by motorists in time to exit from the freeway. Sometimes, the state also posts small official signs (normally blue) indicating what types of gas stations, restaurants, and hotels are available at an upcoming exit; businesses may add their logos to these signs for a fee.

  Octane

In Australia, gasoline is unleaded, and available in 91 (normally with to 10% ethanol), 95, 98 and 100 octane (names of various gasolines differ from brand to brand). Fuel additives for use in cars designed for leaded fuel are available at most gas stations.

In Canada, the most commonly found octane grades are 87 (regular), 89 (mid grade) and 91 (premium), using the "(R+M)/2 Method".

In China, the most commonly found octane grade is RON 91 (regular), 93 (mid grade) and 97 (premium). Almost all of the fuel has been unleaded since 2000. In some premium gas stations in large cities, such as Petrol China and SinoPec, RON 98 gas is sold for racing cars.

In Europe, gasoline is unleaded and available in 95 RON (Eurosuper) and, in nearly all countries, 98 RON (Super Plus) octanes; in some countries, 91 RON octane gasoline is offered as well.^{[citation needed]} In addition, 100 RON petrol is offered in some countries in continental Europe (Shell markets this as V-Power Racing [1]). Some stations offer 98 RON with lead substitute (often called "Lead-Replacement Petrol, or LRP).

In New Zealand, petrol is unleaded, and most commonly available in 91 RON ("Regular") and 95 RON ("Premium"). 98 RON is available at selected BP ("Ultimate") and Mobil ("Synergy 8000") service stations instead of the standard 95 RON. 96 RON was replaced by 95 RON, and subsequently abolished in 2006. Leaded fuel was abolished in 1996.

In the UK the most common petrol grade (and lowest octane generally available) is 'Premium' 95 RON unleaded. 'Super' is widely available at 97 RON and some large brands offer 98 - 99 RON fuel at prices up to 10% more than standard 'premium' fuel (for example Shell V-Power, BP Ultimate or Tesco 99). Leaded fuel is not widely available.

In the United States all motor vehicle gasoline is unleaded and is available in several grades with different octane rating; 87 (Regular), 89 (Mid-Grade), and 93 (Premium) are typical grades [2]. The maximum octane rating in California is generally 91. Minimum octane levels are often lower in the Mountain States, where regular unleaded can be rated as low as 85 octane.

In the U.S. gasoline is described in terms of its "pump octane", which is the mean of their "RON" (Research Octane Number) and "MON" (Motor Octane Number). Labels on gasoline pumps in the U.S. typically describe this as the "(R+M)/2 Method". Some nations describe fuels according to the traditional RON or MON ratings, so octane ratings cannot always be compared with the equivalent U.S. rating by the "(R+M)/2 method".

  Differences in fuel dispensers

In Europe and Australia, the customer selects one of several color-coded nozzles depending on the type of fuel required. The filler pipe of unleaded fuel is smaller than the one for fuels for engines designed to take leaded fuel. The tank filler opening has a corresponding diameter; this prevents inadvertently using leaded fuel in an engine not designed for it, which can damage a catalytic converter. In some European countries leaded fuel is no longer generally available, with LRP (lead replacement petrol) being the only fuel available for engines which need it.

In most stations in Canada and the USA, the pump has a single nozzle and the customer selects the desired octane grade by pushing a button. Some pumps require the customer to pick up the nozzle first, then lift a lever underneath it; others are designed so that lifting the nozzle automatically releases a switch. Some newer stations have separate nozzles for different types of fuel. Where diesel fuel is provided, it is usually dispensed from a separate nozzle even if the various grades of gasoline share the same nozzle.

Motorists occasionally pump gasoline into a diesel car by accident. The converse is almost impossible because diesel pumps have a large nozzle with a diameter of ¹⁵⁄₁₆ inches (23.8 mm) which does not fit the ¹³⁄₁₆-inch (20.6 mm) filler, and the nozzles are protected by a lock mechanism or a liftable flap. Diesel fuel in a gasoline engine — while creating large amounts of smoke — does not normally cause permanent damage if it is drained once the mistake is realized. However even a liter of petrol added to the tank of a modern diesel car can cause irreversible damage to the injection pump and other components through a lack of lubrication. In some cases, the car has to be scrapped because the cost of repairs exceeds its value. The issue is not clear-cut as older diesels using completely mechanical injection can tolerate some gasoline — which has historically been used to "thin" diesel fuel in winter.

  Risk of accidental ignition

It is prohibited to use open flames and, in some places, mobile phones^[24] on the forecourt of a filling station because of the risk of igniting gasoline vapor. In the U.S. the fire marshal is responsible for regulations at the gas pump. Most localities ban smoking, open flames and running engines. Since the increased occurrence of static-related fires many stations have warnings about leaving the refueling point.

Cars can build up static charge by driving on dry road surfaces. However many tire compounds contain enough carbon black to provide an electrical ground which prevents charge build-up. Newer "high mileage" tires use more silica and can increase the buildup of static. A driver who does not discharge static by contacting a conductive part of the car will carry it to the insulated handle of the nozzle and the static potential will eventually be discharged when this purposely-grounded arrangement is put into contact with the metallic filler neck of the vehicle. Ordinarily, vapor concentrations in the area of this filling operation are below the lower explosive limit (LEL) of the product being dispensed, so the static discharge causes no problem. The problem with ungrounded gas cans results from a combination of vehicular static charge, the potential between the container and the vehicle, and the loose fit between the grounded nozzle and the gas can. This last condition causes a rich vapor concentration in the ullage (the unfilled volume) of the gas can, and a discharge from the can to the grounded hanging hardware (the nozzle, hose, swivels and break-a-ways) can thus occur at a most inopportune point. The Petroleum Equipment Institute has recorded incidents of static-related ignition at refueling sites since early 2000. [3]

Although urban legends persist that a mobile phone can cause sparks, this has not been duplicated under any controlled condition. Nevertheless, mobile phone manufacturers and gas stations ask users to switch off their phones. One suggested origin of this myth is said to have been started by gas station companies because the cell phone signal would interfere with the fuel counter on some older model fuel pumps causing it to give a lower reading. In the Mythbusters episode "Cell Phone Destroys Gas Station", investigators concluded that explosions attributed to cell phones could be caused by static discharges from clothing instead and also observed that such incidents seem to involve women more often than men.

The U.S. National Fire Protection Association does most of the research and code writing to address the potential for explosions of gasoline vapor. The customer fueling area, up to 18 inches (46 cm) above the surface, normally does not have explosive concentrations of vapors, but may from time to time. Above this height, where most fuel filler necks are located, there is no expectation of an explosive concentration of gasoline vapor in normal operating conditions. Electrical equipment in the fueling area may be specially certified for use around gasoline vapors.

  See also

• Autogas (LPG)
• Biofuels
• Convenience store
• Ethanol
• Gas pump
• Gasoline usage and pricing
• Gasoline
• Highway oasis
• Hydrogen station
• List of automotive fuel brands
• National Association of Convenience Stores
• Petroleum
• Propellant depot a gas station in space
• Road trip

  References

  Further reading

• John A. Jakle, Keith A. Sculle. The Gas Station in America (Creating the North American Landscape). Baltimore, Maryland: The Johns Hopkins University Press. 1994. ISBN 0-8018-4723-0.
• Daniel I. Vieyra. "Fill ’Er Up": An Architectural History of America's Gas Stations. New York: Macmillan Publishing Co., 1979. ISBN 0-02-622000-8.

  External links

Wikimedia Commons has media related to: Filling station

Look up filling station in Wiktionary, the free dictionary.

• Gasoline price comparisons at the Open Directory Project
• Gas-Pumping Robot at HowStuffWorks
• 2011 NACS Annual Fuels Report
• Energy Policy: How Gas Stations Price Gas at HowStuffWorks
• NPN Station Count (USA 1996-2006)
• An interview with architectural historian Jim Draeger about the history of filling stations from Wisconsin Public Television

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