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Old Apr 17, 2012 | 03:56 PM
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Fuel pressure

02 7.3 fuel pressure sometimes it go from 100 to 70 psi when you mated it . Then goes back to 100 when you let off. New electric gauge, 2 sensors both of them do the same thing. Driving holding 70 psi then stop turn it off wait five min then start it and then it goes to 100 psi has anyone seen this before? most of the time it maintains 70 psi.
 
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Old Apr 17, 2012 | 04:14 PM
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429 f-100
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fpr is sticking . thats my guess i had to rebuild mine a year ago same thing .
 
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Old Apr 17, 2012 | 04:22 PM
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From: Gary,Indiana
I agree with Wes Riffraff Diesel: Fuel Pressure Relief Rebuild Kit
 
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Old Apr 17, 2012 | 05:26 PM
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It looked ok working smoth didn't seem to be sticking
 
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Old Apr 17, 2012 | 05:36 PM
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429 f-100
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here is a pic of mine doesnt really look that bad but it was sticking alot of the time.
 
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Old Apr 17, 2012 | 05:56 PM
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Originally Posted by fspadave87
02 7.3 fuel pressure sometimes it go from 100 to 70 psi when you mated it . Then goes back to 100 when you let off. New electric gauge, 2 sensors both of them do the same thing. Driving holding 70 psi then stop turn it off wait five min then start it and then it goes to 100 psi has anyone seen this before? most of the time it maintains 70 psi.
I had a similar issue and found that my FPR was sticking. I replaced it and now things are operating normally again. Mine didn't look bad, but it was. When I first took it apart I noticed a smashed looking rubber seal on the poppet valve. I found a suitable o-ring from my spare parts and tried it but my pressures were too high...(around 80-85 IIRC...). I later ordered the rebuild kit and used the stock spring. My pressure sits right around 68-70 psi now. It drops about 5-7 psi at WOT which I think is normal for these engines.

EDIT: Notice the difference in the poppet valve bushings. There must be at least a couple of different designs out there. The one that Wes posted is different than what I have.
(Credit to PaysonPSD for the last photo below...)
 
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Old Apr 17, 2012 | 06:59 PM
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Thanks guys will replace it
 
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