1992 Ford F-150 fuel pump?

JUDYRED92

MEMBER
1992 FORD F-150
4.9L
6 CYL
2WD
MANUAL
160 MILES

When I try to start on a wet or cold day, I can hear the pumps come on, it will not start until the pumps turn off, sometimes taking 20 minutes, once they turn off, it starts like a dream and runs great, and will start instantly when its warm and dry, I have replaced everything.

5 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

If you are referring to the fuel pumps, they are only supposed to run for 2 seconds and then shut off until the computer sees a cranking signal.

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Saturday, November 7th, 2015 AT 3:03 PM

JUDYRED92

MEMBER
2 POSTS

I know, when its warmed up or if its a hot dry day, it starts with no hesitation. When it cold or wet or when its been sitting over night, I put the koeo and I can hear the fuel pump run (either tank) for up to 20 minutes they then click off and it starts, no rough idle 22mpg on highway, I have replaced both pumps and check valves, and basically everything under the hood, I am at a loss, fuel pressure regulator has been replaced, ambient air sensor, distributor, cap and rotor.

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Thursday, November 12th, 2015 AT 1:21 PM

WRENCHTECH

MECHANIC
20,757 POSTS

I don't know what you are seeing but the pump doesn't run for 20 minutes without the engine running.

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Thursday, November 12th, 2015 AT 1:42 PM

JUDYRED92

MEMBER
2 POSTS

If you lean down at the rear wheel hub on the driver side you can hear the pump, it makes a fine hissing noise, when you change tanks the hissing noise switches to directly from each tank, and yes they do make a noise

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Thursday, November 12th, 2015 AT 2:03 PM

WRENCHTECH