I have a 2001 F-250 XLT 4x4 with V10. Truck will not start. No fuel pressure. My Haynes manual does not show ignition or fuel delivery wiring. I have found the relay box behind the radio/dash. I need a wiring diagram and info on which relay is the fuel pump relay. Want to know so I can jump relay to see if fuel pump is okay.

Truck had sat for a few weeks being ran very little, so had to jump start yesterday. Ran for about 15 min, the shut off, re-started and ran for 30 min. Truck sat for about 1.5 hours then would not start. Charged battery overnite and it is 100%.

 

Fuel pump relay is inside the dash behind the radio.
If it was me, I would check for power at the pump which will prove out the whole system.
Also, the pump will not run if the engine is not running. It powers up momentarily at key on then shuts off until the engine lights off.
"Proper" testing procedure is to start by checking fuel pressure at the fuel rail, and we infer that you already did that since you say there is no pressure. So if there is power to the pump, that would tell me the pump is bad or there is a fuel line obstruction. If there is no power to the pump when there is supposed to be for the momentary blip @ key on then you would work back along the circuit to see where the circuit has failed. You should be able to hear the fuel pump engage when the key is turned on. Depending on ambient noise you may need a stethoscope.

 

I also think the fuel pump has a relay not a fuse. Inspect the relay as it could be bad. It may get hot and just disconnect the power than when it cools off than it powers back up. Check the fuel filter as it may need to be replaced.

 

Pump is NOT running. Already found the relay, and already swapped with new one. Fuel filter less than 4 months old (doesn't even matter, see above). Without a wiring diagram I would be shooting-in-the-dark. Pump is already changed and will install the tank tomorrow.