i have a mallory 4309 fuel pressure regulator.. how should i set it.. with the fuel pump running or should i have the car running as well? what should the pressure be around 6-8 psi? also what does the vaccum port on the regulator do? will it increase pressure when vaccum drops?if so do i need to set pressure lower so it maxes out at 8ish? any info would be appreciated thanx guys

 

What kind of fuel setup do you have? TBI? TPI? Carb?

a TPI will run at 40 or so PSI at idle. Carb at 6-8 or so.

sorry I don't know how to adjust it.

 

oops thought i included that.. carb hehe

 

Set it with the car running. Run 7psi. You don't need the vac. port unless you are running a supercharger.

 

ah ok thanx! i wasnt sure what that was for

 

you're welcome and good luck.

 

well there isnt really a "set" fuel pressure

if 2 or 3 psi is enough to keep your floats full under all conditions then thats all u need

keep knocking it down till the car sputters then kick it up only as much as it takes to go away..

ccheck your A/F ratoi be make sure then your set

 

i run 5 psi and the idle and all is great. like what was said, mess around until your float and everything seems adjusted correctly