FPR Help Please!
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Junior User
Joined: Jan 2005
Posts: 98
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FPR Help Please!
So heres the story. I decided to shim my fuel pressure regulator. I purchased a fuel pressure gauge that mounts to test port on back of fuel filter no leaks. My friend had a shim kit (from a diesel perf provider) and is selling his truck so I am using those. They have 4 sizes .45, .55, .65, .75.
My pressure started at 48. I first tried the .65 pressure was about 60psi. Hers where things took a turn for the worst. The short version is, I ran out of fuel (driveway is on a hill so it still said 1/4 tank) anyway after my long walk to get fuel, the pressure shot up to 100. I then tried the .55 and .45 and no shim at all and the darn thing still says 100. So what am I missing? I would be happy if I could get back to stock at this point.
-I have been careful putting the cover on I dont think the spring is bound up.
-I am just hoping it doesnt have to do with running out of fuel?
-Truck runs fine, I dont really hear anything or feel anything different.
Thanks in advance guys.
My pressure started at 48. I first tried the .65 pressure was about 60psi. Hers where things took a turn for the worst. The short version is, I ran out of fuel (driveway is on a hill so it still said 1/4 tank) anyway after my long walk to get fuel, the pressure shot up to 100. I then tried the .55 and .45 and no shim at all and the darn thing still says 100. So what am I missing? I would be happy if I could get back to stock at this point.
-I have been careful putting the cover on I dont think the spring is bound up.
-I am just hoping it doesnt have to do with running out of fuel?
-Truck runs fine, I dont really hear anything or feel anything different.
Thanks in advance guys.
Senior User
Joined: Jan 2005
Posts: 315
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From: West Texas
Since you ran out of fuel, running to the very last of the fuel in a tank like that, you may haver sucked up trash in to the fuel system and the trash right now may have your FPR shimmed with debris. Just a thought...
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Junior User
Joined: Jan 2005
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Well I thought maybe something like that too, but Ive had it apart 4 times since then I cant see anything wrong. I guess I'll do it one more time.
Also doing a search I found that some people believe that shimming cant be done on a 99+ (mine is a 2002). Which is interesting because the pictures I have seen everything looks identical to mine. Just theought I would add that too.
Also doing a search I found that some people believe that shimming cant be done on a 99+ (mine is a 2002). Which is interesting because the pictures I have seen everything looks identical to mine. Just theought I would add that too.
Last edited by Trigger; Mar 20, 2005 at 05:06 PM.
Freshman User
Joined: Jun 2003
Posts: 26
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From: central california
check to see if the FPR spring is binding or bent. basically, disassemble and reassemble, while paying very close attention to positioning the FPR cap straight on and equally tightening both screws.
