If you have another person with you. Lay under the truck by the fuel tank and then tur the key to ON, dont start it. You should hear the pump prime and build presure in the tank.
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 the a fuel pump pressure tested.
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.
check it
Fuel pressure test.
1993 sc 400 fuel injection pump location? how do you know if it bad ?
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.
If the relay is bad, then the fuel pump will not work.