need some serious help
Thread Starter
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Senior User
Joined: Jan 2010
Posts: 240
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From: blue springs Missouri
need some serious help
so guys the fuel pressure issue is back. If I start the truck and let it idle for 30 seconds after that the fuel pressure gauge will bounce and climb to 100 psI. If your driving while on the gas the fuel pressure stays at 72 psI and when you let off the gas it climbs back to 100 psi and stays there till you hit the gas. Today I pulled the lines at the bowl and at the frame and ran a wire through them (hard line and flex line) to make sure they weren't clogged and still have the issue. Haven't dropped the tank yet. Both my pre pump filter and bowl filters are clean and new. I've done the hutch and harpoon mods. Any ideas or things to check. I don't have access to a AE so I'm kinda going at thus old school. Thanks guys.
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
etr..see if you can replace the sending unit with a known good one. Is the sensor located pre/post fuel bowl? If post bowl, then only thing that can give high spikes, if the sensor IS good, is the FPR. If it were bad fuel bowl filter or pump, you'd see low psi.
Thread Starter
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Senior User
Joined: Jan 2010
Posts: 240
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From: blue springs Missouri
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Lead Driver
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Guzzle's billet FPR housing is just that, only the housing. The FPR might still be sticking.
You may need this. Dieselorings FPR Rebuild Kit
You may need this. Dieselorings FPR Rebuild Kit
Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Has nothing to do with injectors! Like the other fellow said, it's either a blockage or sending unit-gauge issue. The purpose of the fpr is to regulate the max psi in the fuel bowl. We're you able to blow a good supply of air through the return line all the way into the tank? To the point you could clearly hear air bubbles in the tank? If so its gotta be the fpr. As in the return fitting on the fuel bowl. Some may call the fpr the same as the ipr but thats not what I'm reffering to.
Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Are you using an electric gauge? Have you considered a mechanical gauge with a hose? Kinda like this.
Check out this video on YouTube:
http://www.youtube.com/watch?v=OHcCX...e_gdata_player
Check out this video on YouTube:
http://www.youtube.com/watch?v=OHcCX...e_gdata_player
