FPR Shim

[GM Duraturd]

can anyone tell me in detail how to do the fpr shim mod.

[strokin94]

here ya go OBS FPR Shim and Gauge Install

[GM Duraturd]

thanks strokin94

[strokin94]

no problem.....thats what were all here for

[GM Duraturd]

does the mod make much of a difference? are there any risks? If no risks, it cant hurt performance to try it.

[NoLimits]

I just did the mod 5 mins. after reading this post and am happy with the slight gain that I got. I don't have a chip yet so these cheap mods sure do help. I also realized that my fuel pressure sending unit for my guages are in the wrong location so I will fix that this weekend.

[groomzybanshee]

if i do this mod do i need to put a gauge in or will i be fine with out one?

[pipelayerjdh]

Originally Posted by groomzybanshee

if i do this mod do i need to put a gauge in or will i be fine with out one?

You don't have to use a permanent gauge. You can just use a mechanic's gauge at the schrader valve to check the pressure after the shim. You need to make sure the pressure isn't over 70 psi so it doesn't damage the pump.

[7.3TurboDiesel]

I'm gonna do this mod later in the week. I read the instructions and i have a few questions. One, when I release pressure from the schrader valve will diesel spray out? Two, after I shim the fpr and install the gauge do i have to repressurize the system with something or when i start the truck will it do it by it's self?

[pipelayerjdh]

Originally Posted by 7.3TurboDiesel

I'm gonna do this mod later in the week. I read the instructions and i have a few questions. One, when I release pressure from the schrader valve will diesel spray out? Two, after I shim the fpr and install the gauge do i have to repressurize the system with something or when i start the truck will it do it by it's self?

I have never had fuel spray out, but to be on the safe side, I put a rag over it when pressed. You don't have to do anything other crank it and check the pressure after the install.