fuel pump??? not again - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 02-27-2012, 06:46 PM Thread Starter
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fuel pump??? not again

Ok here's the low down turn key on fuel pump runs longer than usual engines starts fine bit I can hear something running I usually don't hear .The last time this happened I had to replace a fuel pump and three investors or so I was told any insight greatly appreciated
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post #2 of 8 Old 02-27-2012, 06:52 PM
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Sounds like your vacuum pump. Without more explanation its hard to say.

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post #3 of 8 Old 02-27-2012, 07:24 PM Thread Starter
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Negative like I said I've heard and experienced this before I'm just trying to head it off at the pass
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post #4 of 8 Old 02-28-2012, 02:31 PM
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What do you mean the fuel pump runs longer than usual. It will run for 30 seconds or so then stop if you dont start the engine. This is timed through the PCM I believe.

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post #5 of 8 Old 02-29-2012, 07:04 AM Thread Starter
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As noted from prior incidents if your fuel pump starts to loose pressure it cycles longer to reach pressure and sounds tired ,running under these conditions will cause injector fuel starvation .I've replaced the HFCM before with oem part this time I'm just replacing the pump.itself with an airtex at almost half the cost anyone used this method
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post #6 of 8 Old 03-02-2012, 12:54 PM Thread Starter
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HELP!!! I've posted this on the urgent 911 thread as well after replacing the hfcm ,the airtex didn't work , I still have the fuel pump duty cycle hum which I know is not normal does anybody have a clue ???? Fuel gauge is on the way
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post #7 of 8 Old 03-02-2012, 01:20 PM
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You're being ridiculously vague. Bit if you "think" it's cause it's not reaching pressure, check the actual psi. Or throw parts and labor. Drop tank, check pickup tube/screen. New fpr. Change filters.

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post #8 of 8 Old 03-06-2012, 01:29 PM
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Quote:
Originally Posted by jesilvas View Post
You're being ridiculously vague. Bit if you "think" it's cause it's not reaching pressure, check the actual psi. Or throw parts and labor. Drop tank, check pickup tube/screen. New fpr. Change filters.

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Agreed. Until you get a gauge on it, its gonna be all guessing. you may have to install a vacuum gauge on the fuel pump pick up line if you dont want to go through dropping the tank. Plastic or metal tank? metal tank had delamintion problems and it may have clogged the pick up.

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