Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Smokey idle, and surging at cruise speed.
Cliff Ruggles:
Sounds like your fuel pump isn't keeping up if it's fine in low gear then developing issues at the top of 2nd gear. Slowing down allows the bowl to re-fill then fine once again.
Being a little wet in the voids really doesn't tell us much.....Cliff
Mudsport96:
Well, between working 15hour days six days a week and remodeling the basement, I was able to get a pressure gauge on the fuel line today. It isn't a liquid filled one so it was shakey, but at idle the needle jumps between 8 and 15 psi. When I shut it off, it settled in at 12psi.
Revving the engine just made the needle more erratic so I'm going to get a better gauge to see if it smooths out. But, if this gauge is right, this may be a big part of my problem. Including the stall after wot, maybe its pushing the needle off of the seat and flooding. Like I said I'm going to get a better gauge and retest.
77cruiser:
If the gauge is right that's way too much. 6 psi would be good.
Mudsport96:
Right, heck 12 to 15 is where GMs TBI runs for pressure haha
Cliff Ruggles:
For sure a spike in pressure will cause what you are seeing. Those carbs will take a lot of fuel pressure, but I've had issues with mechanical pumps because the flow isn't smooth and pressure inconsistent.
Years ago I bought a Carter 120gph pump to help solve fuel delivery issues with my Ventura. It was fine most of the time, but every once in a while it would flood in similar fashion to what you are seeing.
I finally got fed up with it and installed a gauge. Pressure was pretty steady most of the time at 9 to 9.5psi, then it would occasionally spike to over 12psi. I got rid of that pump and went to an electric pump with a regulator and it solved both issues, fuel delivery and flooding......Cliff
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