Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

QJ wanting to stall at idle - marine application

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Kenth:
Check for 4-6 psi of fuel pressure.
More than 6 psi rises the fuel level to the point of nozzle drip, idle instability, over-rich low-end mixtures and hot-start problems and even flooding can occur during idle and slow-speed driving.
One cure for too high fuel pressure is to lower float settings some.

Cliff Ruggles:
Did you try backing out the idle mixture screws to stop the nozzle drip? 

todhunter:
Cliff - I haven't tried that yet.  How should I do that - evenly on both sides, 1/4 turn at a time and see if the drip stops?  How many turns is too many?

todhunter:
Also, I haven't had the chance to check fuel pressure yet.  But, I did run the boat last weekend and it had the same symptoms after slowing down from a long-ish run.  Also it did something new that I haven't experienced before - as we were running the boat at one point I could feel it start to loose power.  I backed the throttle down some, and it seemed to steady up, then when I tried increasing throttle, it was unresponsive.  Ultimately it just bogged itself down and died.  I let it sit for about a minute and it fired right back up, then we slowly finished our trip back to the ramp at a slower speed and it did fine.  I'm guessing it's all related, and all symptoms of the flooding.

Cliff Ruggles:
Loosing power on a hard steady run also indicates a fuel delivery or fuel control issue with the float/needle/seat assembly.  This assumes the fuel filter is installed correctly and not plugged up.....

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