fpr shim??

[rcfatcat]

Ok first off what is a fpr shim and does any one have a write up/pictures on how to do it and what are its benefits? Any info would be great thanks.

[kanuck15]

It bumps up the fuel pressure on higher mileage trucks. Just stand directly infront of your truck and find the fuel filter. Look to the right slightly. A small grey boxish piece on the filter housing. Take the brass plug out its a 17mm. Be careful not to lose the spring or the shuttle in there. Put a 3/16ths bb in the shuttle and reinstal the spring. Then check your fuel pressure. Don't go above 70psi