F150 fuel pump?????

50

Asked by Jul 17, 2014 at 03:22 PM about the 1991 Ford F-150 XLT Lariat 4WD LB

Question type: Maintenance & Repair

I have a 91 F150, 4x4, auto, 5.0, with duel tanks. I parked it a couple months ago after
I bought a newer truck. went to seel it and now it won't start. Started everytime before.
When I turn the key on I can hear the fuel pump run, and it keeps running. It's suppose
to run for a second then stop right? The engine turns over but it won't fire. I thought it
was out of gas, so I put some in it, and it ran, next day same thing, won't start. Tried
the other tank, same deal can hear the fuel pump running non-stop.

5 Answers

42,375

Sounds like the supply line broke. Like it's just circulating fuel within the tank. Can you see fuel hitting the ground?

2 of 2 people found this helpful.
50

I will check to see if there is any fuel hitting the ground. Just to clarify, when you turn the key on the fuel pump primes its self, then stops right? then of course when you start the engine the pump will run. on mine it doesn't seem to be priming it's self, like maybe it's out of gas, but I know there is gas in the tank.

2 of 2 people found this helpful.
42,375

That's how I always figured they worked. Never torn apart a Ford before. Do you have a port to hook up a fuel pressure gauge? That way you will know if it's working.......

3 of 3 people found this helpful.
50

well I got ahold of a pressure gauge, and I have 44psi with the key on engine not running. Fuel pump is still running all the time

3 of 3 people found this helpful.
42,375

Well the only thing I can think of is the fuel pump relay is stuck in the closed position, which makes continuous contact, causing the fuel pump to remain on. Have you tried replacing that yet?

2 of 2 people found this helpful.

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