FPR shimming
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FPR shimming
soo basically a quick discussion i guess a while back i shimmed my FPR and i get blowing the fuel filter o-ring out...what could have been the reason for this?? just too big of a shim?? i havent put a shim back in since that but i was just curious on why it would hav been doing that..it would just blow the o-ring right out of the fuel filter lid...
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Senior User
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i think a number 10screw i shimmed down to the width of right around a nickel....any less it seemed like it wouldnt be worth it
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Postmaster
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Have you thought about putting a fuel pressure gauge on to see what the pressure is stock and with the shimm?
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Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
The fuel pressure is not controlled by the PCM. Injection pressure is controlled, however, by the PCM thru the IPR.
Senior User
Joined: Mar 2007
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From: Issaquah, WA
You're talking about the big o-ring at the lid as oppossed to the drain o-ring right? What method do you use to tighten the lid. Don't ask me how I know, but if it invloves tapping on something inserted in the webbing of the fuel bowl lid, the o-ring tends to bind and be prone to blow out. Now I use a fuel lubricated o-ruing and pair of channel locks opened wid and inserted in the lid webbing to tighten things down evenly and I have no problems even with my FPR.
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From: nova scotia, canada
you need to put a gauge in the fuel bowl. when i shimmed my fpr it took 9 different screw heads to fine tune it to where i wanted it. those factory pumps dont like above 100psi. ive got mine around 75psi. the gauge allows you to keep trying and stop guessing.
there is a plug in the back of the bowl that is easy to get at. i have left my gauge in just to be able to monitor the pressure.
there is a plug in the back of the bowl that is easy to get at. i have left my gauge in just to be able to monitor the pressure.
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Joined: Mar 2003
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From: nova scotia, canada
i leave the gauge under the hood. its not pretty but it will allow me to check the pressure and monitor any changes.
you need this to set a pressure that wont kill your pump.
i think you pinched the oring, very easy to do, espically if you tried cleaning it with some spray or stretched it with a rag.
you need this to set a pressure that wont kill your pump.
i think you pinched the oring, very easy to do, espically if you tried cleaning it with some spray or stretched it with a rag.