Quote:
Originally Posted by jamie2370
H/SA 350 sbc with quadrajet(Deano carb). Car has a Magnafuel Prostart 500 fuel pump(rated 26-38psi) 12an line to front, Product Engineering Regulator rated 4-12 psi. I am pretty sure that the carb is letting fuel by the needle and seat. It is very rich, sometimes floods out, but then other times at an idle it is perfect. I can not get pressure to go below 6 psi. What is too much pressure for that carb? I know the pump is overkill but it was on the car when I got it. I tried a barry grant regulator that I took off a holley black pump system that was set at 7 psi, it went over 12 psi when I turned the pump on?? SO... do I have a carb issue, too much fuel pressure, or Both lol
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What needle and seat size do you have?
With a 0.125 seat you should be able to go as high as 8 PSI. With a 0.135 seat or larger, I stay around 6 to 6.5 PSI. Check for seat and needle assembly wear or dirt. With the hard to find Grose-Jet needle/seat assembly, I have gone as high as 12 PSI.