I can not figure this out. My Father In-Law washed his engine and then the truck ran for a min and died.
This is a Ford f-150 (1990) with a inline 6, and EFI. I figured he got water in the ignition system. Nope, We noticed that we did not hear the fuel pump start when the key was turned on like it usually does. Figured it was the pump relay, Nope. Thought it was the pump, Nope that wasn't it either. When you turn on the key, the relay activates, injectors go hot, but no fuel pump. We replaced the relay anyhow just to be sure, same thing happened. I got under the truck with a test light, and found that no power was getting to the pump, even though it is hot behind the relay. So I powered the pump directly, it turned on, truck still wouldn't start. Still no pressure, no fuel in the fuel rail at the pressure test port. Thought maybe the gauge was faulty, and it ran out of gas. Put five gal in the tank, still no fuel, pump still doesn't run.

Any Ideas?