Hey, with my fuel pressure regulator at the max setting, how high do you think it will go? I need to know my fuel pressure for tuning purposes and I dont have a guage.

 

If you have a TPI pump in the tank it will go to 18+ psi. The stock TBI pump will not even push 16 psi. With the TPI pump if you do the washer mod it will reach 18 PSI, but proceed cautiously. Coil bind is very close on the stock spring at this point. When you reach coil bind, the pressure will go over 100 PSI easily and quickly.

I once had an "accident" and found out about the 18 psi coil bind thing. On my GMC Jimmy TBI (3.4 in place of 2.8) it went from 18.5-pegging the 60 psi gauge, broke the gauge and seperated the pump from the pickup (pushed the hose apart in the tank)

 

Oops in a hurry, i just installed a walbro pump, i forget which one, i think the 220something one? Sorry for the rush, im in and out, of the garage, trying to have the 383 running so I can stay up till dawn to get it tuned enough to drive it tomorrow.