stock FPR psi
- Thread starter IGottaSy
- Start date
SY2455
70's Veteran
Re: stock FPR psi
As shipped from the factory, check via the service manual 35 to 38 psig. As far as fitting you can check this.
http://198.208.187.182/internet/VehiclePartFits.jsp?autosel=A&part=217-404
But most people go with a AFPR do to the fact that GM while testing the truck before offering them for sale to the public tested the trucks at 44 psig, then lower it to 35 to 38 psig to help with emissions. They did the same with the exhaust, All testing was done with just a cat, straight exhaust out the back, no muffler. But the noise police at GM wanted to lower the sound by putting mufflers on them and if I remember correctly they only gain a 3 to 5 decibel reduction with the mufflers that they put on. I kept a copy of the testing in my truck glove compartment to show the police if I got stopped for noise because I did away with the mufflers. Now I have the RPM exhaust on it with a muffler and I thinking about removing the muffler, just haven't decided yet.
By the way, search is your friend.
As shipped from the factory, check via the service manual 35 to 38 psig. As far as fitting you can check this.
http://198.208.187.182/internet/VehiclePartFits.jsp?autosel=A&part=217-404
But most people go with a AFPR do to the fact that GM while testing the truck before offering them for sale to the public tested the trucks at 44 psig, then lower it to 35 to 38 psig to help with emissions. They did the same with the exhaust, All testing was done with just a cat, straight exhaust out the back, no muffler. But the noise police at GM wanted to lower the sound by putting mufflers on them and if I remember correctly they only gain a 3 to 5 decibel reduction with the mufflers that they put on. I kept a copy of the testing in my truck glove compartment to show the police if I got stopped for noise because I did away with the mufflers. Now I have the RPM exhaust on it with a muffler and I thinking about removing the muffler, just haven't decided yet.
By the way, search is your friend.
SY2455
70's Veteran
Re: stock FPR psi
That why everyone goes with a AFPR. On my truck it seem to like 45 LBS with the vacuum line plugged for setting and then reconnected :tup:.
That why everyone goes with a AFPR. On my truck it seem to like 45 LBS with the vacuum line plugged for setting and then reconnected :tup:.
The Devils Own Chariot
Active member
SY2455
70's Veteran
Re: stock FPR psi
Was that before your 255 pump or the AFPR? Because every stock truck that I have seen run at the 35 to 38 psig. About 10 trucks totaled.
Was that before your 255 pump or the AFPR? Because every stock truck that I have seen run at the 35 to 38 psig. About 10 trucks totaled.
Davemc1963
93 Ty Owner
Re: stock FPR psi
Just for a little more input/reference.
I did a quick check of my Fuel pressure with the vac line connected (stock FPR). I was checking it to check for injector leak down, trying to track down something a start up issue. With the engine running it was steady at 38psi. When I switched off it, the pressure steadily crept up to 43psi. and pretty much stayed there for 10 minutes. I expected it to increase a instantly after switching off and then drop down a little more after that due to injector leakage. I was happy though that the pressure stayed up.
Just for a little more input/reference.
I did a quick check of my Fuel pressure with the vac line connected (stock FPR). I was checking it to check for injector leak down, trying to track down something a start up issue. With the engine running it was steady at 38psi. When I switched off it, the pressure steadily crept up to 43psi. and pretty much stayed there for 10 minutes. I expected it to increase a instantly after switching off and then drop down a little more after that due to injector leakage. I was happy though that the pressure stayed up.