Fuel Pumps
Nissan Maxima
Ford Crown Victoria
Ford Expedition Eddie Bauer

How do you know if you have a bad fuel pump?


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Wiki User
2010-02-15 16:28:49
2010-02-15 16:28:49

Check the presure in the fuel line. 35 psi should be your mark! Keo


Related Questions

Bypass the relay and if the pump works the relay is bad.

A fuel pump pressure test could determine the condition of the fuel pump and fuel system.

how do i know the fuel pump is going bad in a 1998 ford expedition eddie bauer?

Have a fuel pump pressure test done.

check the the pump pressure at the rail

If there is no fuel pressure and the fuel pump circuit, fuse and relay checks okay.

If the relay is bad, then the fuel pump will not work.

1993 sc 400 fuel injection pump location? how do you know if it bad ?

Bad fuel pump, blown fuel pump fuse, bad fuel pump relay, or clogged filter.

If the fuel pump becomes noisy you can rest assured it is going bad. But, the pump maybe going bad and not make any noise at all. Anytime you have a problem with fuel delivery, first thing to do is replace the fuel filter. After replacing the fuel filter a fuel pressure test will verify the condition of the pump.

When a fuel pump is bad the vehicle will not start. A fuel pump that is going bad may cause the vehicle to shut off while going down the road.

If it has an electric fuel pump you will be able to hear it hum when you turn the car to the run posistion. If you can not hear it hum then its bad. On a mechanical fuel pump you can loosen on of the lines and crank the vehicle. If no fuel comes out the it is bad

Of course if the fuel pump is not running the fuel pump fuse, fuel pump relay, or the pump itself is defective. But the pump can be running and still be not pumping fuel. The only way to know for sure is to run a fuel pressure test. Do not overlook the fuel filter as it may be clogged.

If you do not hear the pump run of course it is bad or the fuse or relay is defective. Even if it is running the pump may be defective and not pumping any fuel. A fuel pressure test will verify the condition of the fuel pump. Make sure you replace the fuel filter.

If your fuel pump is not running , it could also be the fuse for the fuel pump relay , the fuel pump relay , a bad electrical connection , or a bad fuel pump

A few possibilities could be the fuel pump relay is bad, the fuel pressure regulator is bad, the fuel pump circuit wiring may be bad and maybe the new pump is bad.

If fuel filter is plugged car will idle but starve for power as it is getting very little fuel, If fuel pump is bad car will wind over but not start " no fuel going to engine " A little trick I use pound on bottom of fuel tank while engine is turning over if engine starts then you know you have a bad fuel pump

Put a fuel pressure gauge on it and that will tell you.

You just don't know until a mechanic tells you.

Swap it with a known good one.

The best way to know if your 1988 Suzuki Intruder VS700GL fuel pump has gone bad is that the bike stalls. When you start it up, it will stall.

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