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Apr 20, 2011 | 05:55 PM

429 f-100

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Laughing Gas

Joined: Nov 2010

Posts: 915

Likes: 1

From: oriental NC.

one thing after another

just finished all the body work and painting the whole truck a month and a half.. see crash thread. when my alignment guy brought my truck back to me today he said he was watching all the gauges while i was driving and the fuel pressure was bounceing from 80 to 100 ! what ive never seen above 66 . i drove home for the first time in a month and a half about 40 miles. he was right 80 -100 then by the time i got near my house it was just pegged at 100 or more and didnt move. my first thought was sending unit but i did a little testing i got on it hard and shifted thru (i have a manual 6 speed) gauge would drop to 80 when pounding in between shifts. so im thinking mabey fpr sticking?this truck took a very hard hit could it have dis logged the poppet? i was reading some other posts here about this.i got a fpx from caly to install but im thinking i need to order the poppet and whatever else isnt in the fpx. also wondering if ok to drive at that pressure i just know something gonna give. even with problems it is good to drive her agian

Apr 20, 2011 | 06:52 PM

F350-6

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Joined: Mar 2007

Posts: 26,966

Likes: 50

From: Texas

Strange how these things seem to run in groups. I'd guess it's time to rebuild the FPR and I don't think the FRX will help the issue any. When mine did that I tested it with and without the FRX and it made no difference in pressure. Swapping it back and forth a couple of times did fix my issue and "Unstuck" whatever part was causing my issue. I got the parts from Bob to fix the FPR which I'll be doing soon.

Brandon has been driving his at something like 95 psi for a couple of years so I'd say you're safe driving it around unless it causes extra strain on your fuel pump.

Apr 20, 2011 | 08:15 PM

429 f-100

Thread Starter

Laughing Gas

Joined: Nov 2010

Posts: 915

Likes: 1

From: oriental NC.

thanks chris i read your post agian tonight before i posted this , i had read it back then and it sounded the same . so i think im gonna drive it back to the shop and park it and order the rebuild kit. dont want a fuel leak to ruin my day.so yours just went away ? i think i might tap it with a hammer before i leave in the morning.

Apr 20, 2011 | 08:25 PM

F350-6

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Joined: Mar 2007

Posts: 26,966

Likes: 50

From: Texas

Yes mine just went away. I took it apart while swapping the FRX for the stock FPR and then again swapping back to the FRX. Still had high pressure so I ordered the rebuild kit. About 50 miles after I ordered the kit the pressure suddenly was back to normal.

It didn't happen right away after taking things apart and putting them back together, it was just something I noticed when I turned the key on. I'm thinking Bob's (Guzzle) fast response and shipping scared it into acting right.

Apr 20, 2011 | 08:35 PM

429 f-100

Thread Starter

Laughing Gas

Joined: Nov 2010

Posts: 915

Likes: 1

From: oriental NC.

[It didn't happen right away after taking things apart and putting them back together, it was just something I noticed when I turned the key on. I'm thinking Bob's (Guzzle) fast response and shipping scared it into acting right.

[/quote]

how many miles did you drive with the high pressure ? i thought branndon removed his fuel bowl and ran hoses to the rear of the heads.i hate to park it lookin so good .