This only applies to cars with the fuel pressure regulator mounted on the fuel rail. Most 1995 vintage cars will have this. If you want to lower your base fuel pressure below stock levels, you have to dismantle the stock FPR. First thing is to start the car and then pull the power for the fuel pump [under the rear seat]. The car dies and the you can now open up the fuel rail. You need split ring pliers that have a 90 degree bend at the tip. You use the pliers to remove the split ring that holds the stock FPR in place. Its a good idea to hold the FPR with a thumb while you remove the split ring [there is still some pressure in the fuel rail]. When you get the split ring off, put a big rag under the FPR. If you put a little less pressure on the FPR, the gas will start to leak out onto the rag. Let it all leak out and then pull the FPR off. Then take a hack-saw and cut the FPR where indicated in the pic above. You can also pull off the plastic filter on the wider part of the FPR. You can clean up the cut with a file and a 0.5" drill bit. Use gasoline or alcohol to thoroughly clean filings out of the FPR. Let it dry. Put some fresh oil on the o-ring of the FPR and put it back on [don't forget the split ring]. Start the car up and look for leaks. I've assumed that you have a secondary fuel pressure regulator in the fuel return line. You can now use the secondary fuel pressure regulator to mess with the fuel pressure all you want. This is especially useful if you are tuning bigger fuel injectors.
Contributed by Corbin
Cars Modifications Power Turbo Fuel_System FPR Disable
Last modified on 2008-12-14 13:03:29