Jan

22

Does a fuel pump on a car send fuel to the engine all the time or just when you first start the car?

Filed Under Maintenance & Repairs

bj asked:

Or more generally, how does a fuel pump function?

MALCOM

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Comments

5 Responses to “Does a fuel pump on a car send fuel to the engine all the time or just when you first start the car?”

loonatic72 on January 22nd, 2009 9:11 am

ROOSEVELT

If it didn’t pump all the time how would your car run? it has to keep a certain fuel PSI.
gonefishin on January 24th, 2009 11:47 pm

JOHNIE

all the time or it wouldnt run . it works on a relay system that switches it on and off as the fuel is needed. there is also a return to the tank for any unused fuel
peter p on January 28th, 2009 9:53 am

NELSON

think about what you have just ASKED (how would your car RUN.)
done wrenching on January 31st, 2009 5:46 pm

HECTOR

It runs the whole time the engine runs and uses a regulator to send fuel back to gas tank that the engine does not need.
mac on February 1st, 2009 8:50 am

TREVOR

there are 2 kinds, mechanical (they are a diaphragm that is actuated by rotation of the engine) and electrical which is controlled by the cars 12 volt system (relays and sensors) they both pressurize the fuel to either your carb or injection system for constant supply when needed and when they are off will still maintain pressure (unless there is a leak)

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