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 Intake / Carb and Fuel Delivery Tech
 qjet fuel pressure regulator
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beertracker
Cochise

350 Posts

Posted - 07 Sep 2014 :  7:03:21 PM  Show Profile  Reply with Quote
I was reading Jim Hand's book on page 50 he talks about using a fuel pressure regulator for a performance modified qjet. This begs the questions what is it about a modified qjet that requires a pressure regulator and lower fuel pressure?

Out of curiosity I measured the fuel pressure of my oem mechanical pump and it fluctuates between 7 and 8 pounds. My engine is 1975 or 76.

Where there stock qjets produced that work with 7 to 8 pounds fuel pressure? Did some of the oem mechanical pumps have less presssure that 7 to 8? Does it have to do with year of manufacture?

I don't remember Pontiac having fuel pressure regulators factory installed but I could be wrong.

Your thoughts.

I want a LS engine in my Pontiac

Cliff R
Cochise

USA
535 Posts

Posted - 09 Sep 2014 :  07:38:47 AM  Show Profile  Visit Cliff R's Homepage  Reply with Quote
Only the early carburetors are fuel pressure sensitive, pre-1969 for Pontiac units, that used the large float and early hinge pin location.

The later carburetors are fine with high pressure, I run 7.5 psi on my 1977 q-jet, have now for several decades with zero issues anyplace......Cliff

If you can read this, thank a teacher. If you can read this in English, thank a Veteran.
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beertracker
Cochise

350 Posts

Posted - 09 Sep 2014 :  11:16:30 AM  Show Profile  Reply with Quote
Thanks for clearing that up. gs
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