The fuel pump isn't running. I replaced it abut 6 months ago so it shouldn't already be bad. I disconnected the wires and one terminal has 12 volts but I don't know if that is the feed for the pump or just the gauge. Does anyone know what color wire is what for the fuel pump?

 

At the risk of asking the obvious, have you checked the fuse?

 

What brand pump?

 

I think it was precision from Oreilly but not sure. I bought a Haynes manual that shows the black/green wire to be the power to the pump, so I can test that now. Also, I am a little confused about a 'fuel pump relay'. There are 3 relays on the left inner-fender, but I have read mixed info about what they are. the wiring diagram doesn't show a relay for the fuel pump, but the parts store lists one. Aslo, the relays on the fender 'click' if I turn the key on, unplug them, and plug them back in, so I assume the 'click' indicates they are working, whatever they are for.

 

Ok - the truck started. I was checking the fuel pump and discovered that it only runs maybe 1/2 a second when you turn the key on. I primed the engine (poured a little gas into the throttle body) and it started. So now I'm not sure what the problem was.

 

Shut it off, and let it sit for a few hours. Will it restart? If not, cycle the key on/off a few times, just enough to run the fuel pump each time. Try starting it again. Does it start?

If it does, you might be looking at a weak pump.