Dropping fuel pressure???
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Joined: Nov 2004
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Dropping fuel pressure???
I have a 03 f250. The Truck dies after going down the hwy a couple miles. I got it home and changed the fuel filter and checked the fuel pressure at idle and ran about 55. I left the gauge hooked up and ran it down the hwy again and fuel pressure dropped to zero after about a mile. I put a new pump on it now it will run about 10 miles before it drops to zero. Limping it home it gradually came back to about 60. Now what?
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
New filter & fuel pump & still no pressure? I'd check to see if the inlet screen on the fuel pick up line is plugged inside your fuel tank. If the tanks full you could try blowing it out (compressed air backwards in the fuel line behind the pump) to see if you can clear the obstruction but that will only be a temporary fix.
Postmaster
Joined: Sep 2006
Posts: 3,048
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check the voltage at the pump, maybe your pump is shot, or some people had the fuel reset circuit go bad and cause the same problem, check in passenger kickpanel if you dont have any melted wires, or try what F350-6 said
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Originally Posted by Kwikkordead
I vote clogged pickup screen and/or a torn o-ring on one of the quick connects letting in a bunch of air.,
Hotshot
Joined: Dec 2003
Posts: 18,423
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From: iowa
symptoms are identical to what happened with mine when my prepump filter became plugged, thus if you have a prepump filter check there if not my vote goes along with the others on here that mention the pickup screen because that is just exactly what happens.
I would believe that before the oring, since an oring will cause it to lose preasure at idle too not just while driving, plus a bad oring letting air in causes them to really knock where as a plugged screen or prepump filter just causes a drop in fuel preasure as you drive
I would believe that before the oring, since an oring will cause it to lose preasure at idle too not just while driving, plus a bad oring letting air in causes them to really knock where as a plugged screen or prepump filter just causes a drop in fuel preasure as you drive
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