Lossing fuel pressure
Thread Starter
Heel & Toe
Joined: Sep 2014
Posts: 22
Likes: 0
From: MALTA NY
Lossing fuel pressure
need some HELP, my 99 is losing fuel pressure hard start after sitting. checked with gauge 60# with prime and about 58# running. Shut it off and slowly drops pressure. This is after I checked injector, no leaks, replaced filter/regulator, I also replaced check valve since that seemed to be a problem with an aftermarket and some new hoses.After all that still have leak down , so now my question is is there a back flow valve in fuel pump ,some say yes and some say no, any input would be greatly appreciated.. THANKS
Tech Contributor
Joined: Jan 2007
Posts: 19,398
Likes: 1,139
From: Dyer, IN
need some HELP, my 99 is losing fuel pressure hard start after sitting. checked with gauge 60# with prime and about 58# running. Shut it off and slowly drops pressure. This is after I checked injector, no leaks, replaced filter/regulator, I also replaced check valve since that seemed to be a problem with an aftermarket and some new hoses.After all that still have leak down , so now my question is is there a back flow valve in fuel pump ,some say yes and some say no, any input would be greatly appreciated.. THANKS
No, there is not a check valve in the fuel pump from 1997-2003.5. Late 2003 - 2004 have the check valve in the pump.
Last edited by lucky131969; Yesterday at 10:29 AM.
Tech Contributor
Joined: Jan 2007
Posts: 19,398
Likes: 1,139
From: Dyer, IN
Thread Starter
Heel & Toe
Joined: Sep 2014
Posts: 22
Likes: 0
From: MALTA NY
THANKS, When I turn key on pump primes to 60 when it stops priming it goes to 55 then I I turn key off then it starts to drop slowly not fast a slow creep. I replaced the original fuel line with check valve and replaced that line with aftermarket valve and high pressure hose along with new filter/reg. Its a mystery to me were its going. THANKS for quick reply
Tech Contributor
Joined: Jan 2007
Posts: 19,398
Likes: 1,139
From: Dyer, IN
THANKS, When I turn key on pump primes to 60 when it stops priming it goes to 55 then I I turn key off then it starts to drop slowly not fast a slow creep. I replaced the original fuel line with check valve and replaced that line with aftermarket valve and high pressure hose along with new filter/reg. Its a mystery to me were its going. THANKS for quick reply
Thread Starter
Heel & Toe
Joined: Sep 2014
Posts: 22
Likes: 0
From: MALTA NY
again thanks, guess i'll see if I can get one. I kinda thought I was figuring out by checking things the way I did injectors 1st no cost, then filter / reg which was needing one then the fuel feed line which was the nightmare and all I did was wast time and $$$$ and the problem still there. I was always told to do thing right and I didn't MY BAD. THANKS for ur HELP
