We were driving and the truck stopped running. i went to the fuel rail and no pressure. i think the relay switch went bad
Check fuses relay on left inner fender in black box take on lid inside of box they are marked if all fusses & relays are all right, then your fuel pump is went bad
SOURCE: truck starts, dies. truck runs good some days,bad the next
I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!
It's under your hood, in one of those boxes, and should be marked. Your pump won't cut in if it's fried either. Check to see if there is power at the pump. Maybe you just have a loose wire. You can always hope!
SOURCE: cranks but won't start,new fuel pump,no power going to pump
look at inerata reset switch check for power at the switch
SOURCE: '88 f150 will not start, 0 fuel pressure
I know the ford cars had a trip relay for the fuel pump. In the event of a wreck it shuts the fuel pump down and has to be reset manually. I am unsure if the pickups had the same thing.
SOURCE: 1991 ford f-150 fuel pump will not come on
remember the switch only gets power for 1 second when u turn the key on, the common problem is the ignition starter switch comes apart, it is located at top of the steering column near the bottom, drop the column down (2 nuts) and inspect the switch for separation.
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