1990 Ford F-150 Q&A
1990 Ford F-150 Question: no power to fuel pump
just to day truck would not start fuel pump not getting power - Visitor
First check the fuse( i think it may be under the hood) then the relay. If these check out, there is an impact switch that cuts off the fuel pump in a roll over or high impact. It is in different locations,... frame, under floor mat, Etc. - Visitor
The inertia switch (incase you roll over) is under the dash and can go bad. You should be able to jump it out to see if that is the problem. I had close to the same problem my computer stopped sending a ground signal to the pump relay. - jph37
fuel selector switch if duel tanks - Visitor
started about a year ago, only just once in a while.last few months it got worse,if i cycled the switch from off to run a few times,pump would eventually prime and start and ran perfect until i tur...
Generating p0171 and p0174 on a 4.9l. Idles perfectly cold fast, hot 650, smooth. No misses, no spark knock, no backfires. Checked fuel pressure, 45 psi full vacuum, 55 psi no vacuum. Replaced MAF ...
i changed out the fuel pump in the front now i dont have any power to it i checked the fuses and relay and the safety button on the pas. side now in down to the fuel select switch what else could ...
I have power to my relay, replaced the relay but have now power on the green and yellow striped wire running to my inertia switch, any ideas or recommended fixes?
It's like it's flooding no power when accelerating it misses bad I have changed out plugs , cop and injectors that showed up a code