What is stock fuel pressure on a 1988 L98 iroc? Please specify vaccum line on or off of the regulator. I would like a static reading though.

 

You set it with the vacuum line off. (Adjustable reg.) But I can't remember the exact pressure.

 

Wi

With the vaccum lines on:
Key on engine not running....36/38 PSI
engine running at idle .....38/40 PS
running at med thottle ......40/43 PSI
This about average for a stock 350

 

Thanks i checked it last night and it was right around those numbers!! Thanks again-Joe

 

If I remember right the Fuel Pressure for a IROC Z TPI is 38-40 PSI

 

1986-to-1990 5.7L/350 MPFI specifications

With full vacuum applied to the regulator (idle):
Use 38psi which is the average of 30.5 and 44psi.

With no vacuum applied to the regulator (WOT):
Use 43psi which is the average of 40.5 and 47psi.

Then you can tweak it from there.