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Im not sure but i think this is how it goes. When you pump, whether you pump holding or use the clip, the fuel is filling up the tank and causing pressure. since you can't pressurize liquid it pressurizes the air in your tank. The air is then pushed down the line to the purge control valve, wicth pushes the air through a charcoal filter, and the gas fumes are gone. Now once the tank is full, and no air is left, the pressure pushing back on the pump will start to build and the pump swicthes off because you can't put fuel the other way through.
What else can I help you with?
Why can I only pump small amounts of gas at a time into my fuel tank with out it overflowing or the gas pump shutting off as if the tank were full in my 1999 cougar?
pump it slower and pull the nozzle out of tank a little while pumping the gas.
Why is the fuel pump not pumping gas in your 91 sundance?
Fuel pump has failed, or fuel pump fuse or relay are defective. Can also be clogged fuel filter.
There is no electricity goin to the gas pump and its not pumping gas to the motor?
More info would help such as model and year of vehicle but start with checking the fuses and fuel pump relay.
Which gas stations still offer full service at the gas pump?
Which gas stations offer full service pumping will vary depending upon where you are located - the only way to know for sure is to look for those stores that advertise full service. In some states, such as Oregon, all stations offer full service pumping.
How can I buy gas with cash?
To buy gas with cash, simply go to a gas station, select the pump, and pay the attendant inside with cash before pumping your gas.
How does prepay gas work when filling up at the gas station?
When you prepay for gas at the gas station, you pay a certain amount of money before you start pumping gas into your vehicle. The gas station attendant or the pump itself will authorize the pump to dispense gas up to the amount you paid. Once you reach that amount, the pump will stop automatically, and you can choose to pay more if you need to fill up further. This system helps prevent customers from driving off without paying for the gas they have pumped.
Will the fuel pump make noise if it is bad?
If the fuel pump is bad it will just quit pumping gas, the electric fuel pump always makes a little noise when running.
If you pump 40.88 kg of octane C8H18 into your gas tank how many molecules of octane are you pumping?
3.487*1013
Must you hold the handle on a gas pump in New York state?
Yes, in New York State, you must hold the handle on a gas pump while refueling your vehicle. Automatic shut-off features on pumps are designed to stop the flow of gas when the tank is full, but unattended pumping is prohibited. This regulation is in place for safety reasons to prevent spills and accidents.
How can I purchase gas using cash?
To purchase gas using cash, simply go to a gas station, select the pump, and pay the attendant inside with cash before pumping your gas.
How do you check fuel pump 2001 Malibu?
Disconnect fuel line from pump and start car...if it spits gas out, its working,if no fuel spits out, chances are fuel pump is not pumping fuel.
Why do you have to step on the gass to get your car to start and if you dont step on gass it dieys but dose not do it all the time.?
Do you know if the engine has a carburetor or is fuel injected? Fuel injected should not require stepping on or pumping the gas pedal as sensors in and around the engine determine the amount of gas for starting and running. An engine with a carburetor typically has a choke that controls the amount of air that is delievered to the engine. if the choke is staying/stuck open, pumping the gas pedal will pump gas into the intake manifold which feeds the power cylinders. Pumping the gas on a fuel injected engine does not pump gas into the intake manifold. If the choke is sticking from time to time it could cause this problem (intermittent as you describe)
