Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

More nozzle drip big block 427 chevy

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chasrahm:
Update:
I changed the idle bypass to .110"
Drove the car and still couldn't get the throttle plate closed enough to not have nozzle drip.

I pulled off the air horn and raised the float to .25". 

Did I just make it worse?  Really stinks rich now.  Lots of dripping nozzle.  Can't close throttle plate.  The idle speed screw is set about 2 full turns on the linkage.

Getting frustrated.

77cruiser:
Lower the float to .375. How much fuel pressure do you have?

chasrahm:
After reading and studying last night, I have to go back and mess / check with the timing.  In March, I installed a five speed.  Looking back, I wasn't present when my helper friend installed the distributor.  Car drives great, starts well, but I never checked where he set it.  Frankly, I haven't thought about it until now.
I'll report back later tonight.

chasrahm:
So I've set the ignition timing,mostly by ear.  I'm finding the place where the engine runs best and vacuum is highest.  The engine jumps to life when started.  I then take it to 2,000 rpm and see if I can micro turn it to see if I pick up a few rpm.  Not much change.
At 1,000-1,100 rpm, my manifold vacuum has a very fast pulse to it and oscillates between 16-18.
As the rpm drops to 700, vacuum falls way off below 10hg. 
The vacuum advance is a B1 unit, a stock unit, giving 8 degrees distributor at 16-18hg.

So I used my vacuum pump to hold 16hg on the vacuum advance and started the engine.  It was idling at 1,100 so I slowly turned the throttle screw out to slow the idle rpms.  As it approached 700, I still visually the same amount of nozzle drip.

What to try now?

ejowrench:
Follow cruiser77's advice and get a fuel preasure guage and LOWER your float level. Also check the condition of your float itself. Let us know what PSI you have at idle and 2000RPM.

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