Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Float setting?
Jimpala:
Tonight I took fuel pressure reading off the new fuel pump....10psi. Repeated the test 3 times,even bled any air from test line to be sure of accuracy.
This is frustrating.Never would have guessed a correct pump,application wise,would put out twice the psi of orig pump! I need to find a stock oem look pump that specifically states btw 5-6 psi and approx 40gph.
Maybe I'll get lucky and find an nos ac delco or carter.
Thanks much Cliff for your comment about these new pumps and their psi out put! Jim
von:
I can confirm the aftermarket pump problem. Two different new off-brand pumps from the chain parts store put out 9-10 psi on my '69 350 Chevy. An AC Delco pump fixed it.
68 Firebird:
Von can I ask where you got the AC Delco fuel pump. Was it online or from a dealer.
Having trouble finding one in my area of NJ. Sometimes easier to order online.
This would be for a 68 Firebird 400
Gerry
von:
I believe I got it from Classic Muscle, ordered on-line (www.oldmusclecars.com). It was for a Chevy 350. I don't now if they sell Pontiac parts but since they're a GM dealer they might. Try their website.
Cliff Ruggles:
The factory float settings are often pretty "low" on the later carburetors. They were based on the original applications tuning requirements, fuel pressure, etc. Many later model set-ups used higher pressure pumps, and return systems to keep more fuel in circulation (cooling).
I would also add here that none of the over the counter rebuild kits will contain a good high quality needle/seat assembly, they aren't even the correct size for the carburetor number. Ethanol will quickly find a new part that isn't made of a good quality flouroelostomer. This also effects fuel level, float setting, etc, at any give pressure. We've also vacuum and pressure tested a lot of the seats and many aren't holding.
Just another reason why we stepped up the quality of our parts in recent years, and we have ZERO issues with any of our parts in this new fuel.....Cliff
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