Put the guage on tonight and I still run normal at 50psi but WOT is down to 30psi :shock: Plus I got NO fuel presure when it prime's and soon as I shut off the car, it go's straight to 0 too.

Now I just got to figure out what is causeing my loss in fuel presure. I got a funny feeling its the pump itself :? Not sure what else can cause this. Any guesses?

Fuel filter is only about 3000miles old.

 

Sounds like it's fuel pump time.

 

If you're pushing a 412ci engine w/ the stock fuel pump, it won't keep up.

Think about the Walbro 255 high-pressure gerotor pump.

 

Got a part # for that?

I found a Granatelli Motorsports one, Part #GRN-GM722-2 Fuel Pump, F-Body, In-Tank, Electric, 255 lph, 90 psi, Chevy/Pontiac Camaro/Firebird, are they any good?

So whats a good running and WOT psi? 45psi - 50psi?

 

If you're running a standard TPI fuel tank setup, part# FPG003 from here:

http://www.autoperformanceengineering.com/

Should do the trick.

As for your question about the right fuel pressure...it varies. Build your fuel system to deliver the same pressure at all points in your RPM operating range.

I like 58psi but I'm running a different engine than yours.

-kevin