Is This Right?? Run Regulator At 2lbs And The Car Runs Great!!! - Third Generation F-Body Message Boards

2ponchos · 05-05-2002, 01:09 PM

tuned the car up today playing with the pressure and a buddy set it for some odd reason at 2-3 lbs of fuel pressure i didnt know it but we went and drove it and the car ran liked a raped ape!! i didnt rejet the carb yet but should i be able to run that low of pressure??

Jester · 05-05-2002, 02:46 PM

Nothing wrong with 2-3psi. alot of stock pumps ran in that range.

F-BIRD'88 · 05-05-2002, 06:33 PM

Remove the sight plug from the fuel bowl. With the car idleing
on level ground, check the fuel level in the bowl. If it now is
quite a bit lower than the sight hole, this has effectivly leaned out the mixture. Simular to installing leaner jets. If your combination likes the leaner jetting, reset the fuel pressure to 6/8 psi , adjusting the fuel level and rejet the carb for best performance.

With the fuel pressure at 2 psi your motor may starve for fuel at
high rpm (overly lean) which could damage the motor.

2ponchos · 05-05-2002, 06:42 PM

ok i got two different answers lol nothing wrong with that but what is right!! this is my first time with a carb so i am learning slowly but surely!! thanks for your input

Jester · 05-05-2002, 06:50 PM

Quote:

Originally posted by F-BIRD'88
Remove the sight plug from the fuel bowl. With the car idleing
on level ground, check the fuel level in the bowl. If it now is
quite a bit lower than the sight hole, this has effectivly leaned out the mixture.

changing the fuel pressure should NOT change the level in the bowl. If it does, that means that your pressure was way too high before and was blowing the needle off the seat. That'll cause alot of problems. 2-3 psi is low, but not unheard of. if it runs good and isn't starving for fuel up top...fine. 5-7 is about average.

Float level should be set..once...to right below the sight hole. If it changes, or is much above or below that, it's a bad thing. Then leave it alone and adjust your mixture the normal way.

82camaro · 05-05-2002, 07:44 PM

As long as the fuel pump can supply enough volume to keep the fuel bowl full, the pressure does nothing. You may have a problem with the needle and seat if changing the pressure made that much difference.

2ponchos · 05-05-2002, 09:12 PM

i think i may just run it the way it is and maybe jet it a bit and bring the pressure up a bit.. but other then that i dont think i will have to do anything else.. as one board member stated he used jet number 69's in his but i bought 68 so i may try those and see what happens.. i know it has 72's in it now which is rather big i think but we will see thanks for all the help!!

99Hawk120 · 05-07-2002, 10:40 AM

Yes, carbs don't really much care what the pressure is, as long as it's not too high. They really only care about volume.