What is the maxinum fuel pressure that a 88-92 4.3/5.0/5.7 gm tbi handle? What is the weakest point in the fueling system pressure wise? Can you safely run 25-30psi on one of these units?
Supreme Member
A serch in "fast355" 's post will help, I remember something like 40+psi.
Up to 30psi there is nothing to worry, except tuning and maybe a VAFPR for less waste at low load.
Up to 30psi there is nothing to worry, except tuning and maybe a VAFPR for less waste at low load.
Member
I remember there was a guy on here running 42 psi on his TBI truck.
Weak point is diaphragm. That I know. As you are aware you will need aftermarket / tpi/ lt 1 fuel pump.