95 ford fuel system 5.8 f350

[rick123458]

truck runs perfect when cold. when it warms up fuel pump stops working. relay is good in fuse box. any other relays or computers that would shut down the fuel pump?

[carriedi]

well, the way it is supposed to work is the computer turns on the relay. the relay goes through the inertia switch to the fuel pump.

how do you know the fuel pump stops working? Are you measuring the fuel pump pressure? Are you checking the voltage and ground at the fuel pump? Dark green and yellow is the color of the wire from the fuel pump relay to the inertia switch. Red and yellow is the color for the wire from the inertia switch to the fuel pump. (depending on if you have single or dual tanks)

It is also possible that the fuel pump itself is getting hot and shutting down. If you have good power and ground to the fuel pump but the fuel pump is not running then I would look at the fuel pump. Depending on what you find, if you have a problem with power or ground you just have to follw what you are missing back the the source of the problem.