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1997 - 2003 Ford F150 General discussion on the Ford 1997 - 2003 F150 truck.

fuel pump anomoly

 
Old 03-05-2019, 08:03 PM
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Default fuel pump anomoly

1999 f150
80k

heres one I have been meaning to post - looking for a clue

I had an adventure on an evap code and ended up changing everything gas tank related. Filler neck, filler hose, gas tank, fuel pump, pressure sensor, rollover / vent valves; and viola got rid of the evap code for some time now.

Ever since I put the expensive fuel pump on from Advanced auto here is how my start sequences go:

Engine cold - starts right up
Engine normal operating temperature - run into the store for a quick stop, ready to leave - cranks for 3 sec before starting

tried key on engine off priming 3times, 4times, etc (it does not matter how many times) still get the extended cranking before finally starting

any ideas?
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Old 03-05-2019, 08:16 PM
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Plugs, knock-off coils ? No mention of the engine.
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Old 03-05-2019, 08:32 PM
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Originally Posted by Jbrew View Post
Plugs, knock-off coils ? No mention of the engine.

sorry 5.4l runs great hot or cold, idles well etc. Problem started after changing aforementioned items immediately. Seems like a fuel delivery issue
btw- i also changed the fuel filter at the same times i replaced the other items
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Old 03-08-2019, 03:42 AM
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On the warm start, it's probably the PCM waiting for the start system to verify the correct fuel/air ratio to start OR your fuel pressure regulator is not right.

My 98 5,4 hits immediately when cold. It's so quick that the oil has barely moved. Not happy with that. When warm. about a turn plus and it's running. I'd rather have a couple of rolls before it fires cold. This year when I start him up, I'm going to leave the f/pump relay out for a few turns then fire him off.
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Old 03-08-2019, 07:58 AM
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Good point. Thank you for that perspective.

keep in mind it has done this ever since i changed the fuel pump, even in warmer weather

on a side note wonder if anyone has put a prelube pump in these?
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Old 03-08-2019, 03:46 PM
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I don't think I've ever seen a pre-lube on these, always thought they were cool idea though. They use to have them at work, on select heavy equipment. But now a days, don't even see that anymore. I think the main reason they use them was due to extended down times between cycling the engine.
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Old 03-08-2019, 09:38 PM
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Originally Posted by bigaaron View Post
Good point. Thank you for that perspective.

keep in mind it has done this ever since i changed the fuel pump, even in warmer weather

on a side note wonder if anyone has put a prelube pump in these?
That would make me start w the regulator. More pump pressure w the new pump.
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Old 03-09-2019, 07:59 AM
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Will do seems easy enough
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Old 03-09-2019, 08:22 AM
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Could it possibly be the pump itself?
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Old 03-09-2019, 08:48 AM
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Did you replace just the pump or the hole assembly?
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