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Old 04-12-2012, 08:25 PM
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Fuel pressue issue

Hey guys, looking for a little help. I put the guages in the truck to be able to moniter whats what. So, been a little hard starting the last couple days, and I noticed a few drops of diesel on the ground when I went out in the morning. It seems the truck is losing its pressure as its sits through a leak somewhere at the front of the engine. I had issues with the fuel filter o ring before but cranked it super tight and it seems to be fine. When getting in the truck, the gauge seems to climb to 65psi not shoot like it use to. NOW... Today i was in 140 tune wich is where it stays, I cracked it pretty hard and watched the fuel gauge drop to about 25psi...ouch. I crawled up on top of the engine while running and it wasnt leaking from the fuel bowl or anywhere else up there I could see. I just had the turbo off to do the orings and cleaned the valley, it seems to have accumulated a bit of diesel in the front of the valley, back is dry.. Is anything common on the front of the engine for leaking? and it must be Before the FPR if it drops like that under a load right?
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Old 04-12-2012, 09:13 PM
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Im not sure about that kind of drop. Might just be a lack of fuel pump or something in the tank causing a restriction.

The water drain on the fuel filter is connected to a tube that runs down the passenger front side of the engine. That valve by chance leaking and dripping out of the tube?
Very visible if you crawl under the front.
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Old 04-13-2012, 05:31 AM
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When is the last time you replaced your FPR? There is no reason to assume it needs to be before the FPR. Whats your fuel pressure at idle?

The leak is probably from the bowl somewhere though you would certainly smell it of you were shooting the lost 50 psi out of the circuit. I'd guess you have a small leak (which you should find) and a worn fuel pressure regulator.

Last edited by audiocontr; 04-13-2012 at 05:34 AM.
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Old 04-13-2012, 04:46 PM
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FPR Hasnt been replaced since I've owned it (30k) It runs 65psi at idle. I am going to order the fuel bowl kit from dieselorings, and try that out. Never seen the need to replace the FPR as it was working well.. or so I thought??
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Old 07-01-2012, 09:10 PM
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Ok, So this is an older post but problem is arising again. What happened last time was just a dirty pickup in the tank. Now I have an issue with fuel pressure again, idle is at 65psi, when accelerating sometimes it stays at 65 but upon letting go of the pedal it will jump to 80 sometimes even touch 90psi. Seems to be ok idling, once in a while it will jump up on accelerating but mostly spikes when I let off and that excess pressure seems to build for a few seconds before releasing back to tank. I am 99 percent sure this is a FPR problem, But I want to know if I can ditch the factory FPR and put in a universal adjustable diesel fuel pressure regulator in its spot on the return line back to the tank, this should be good right? any suggestions on a product? I dont want to spend $500 to get this done. Couple hundred would be ok.
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Old 07-02-2012, 07:54 PM
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You can rebuild the bowel and the regulator. Dieselorings.com has the parts and kits and instructions.

Travis T


Sent from my phone...
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Old 07-02-2012, 08:18 PM
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Got her figured, had another FPR and it worked.
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