1992 Ford F-150 fuel pump?

Tiny
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.
Saturday, November 7th, 2015 AT 1:30 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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
Tiny
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
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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
Tiny
JUDYRED92
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  • 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
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Then you have an electrical issue because it's not supposed to do that.
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Thursday, November 12th, 2015 AT 2:05 PM

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