Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Throttle plates closed, but still nozzle drip

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Marx3:
Found a nice 17057253 in the addict and rebuild it to the same specs. Nozzle drip is gone. Idle is a little unsteady, it tends to rise and fall about 150 rpm now and then, but I suppose that is on account of the idle system being calibrated too generously for the stock smog 350
.083 bypass
.051 dcr
.037 tubes
Both IAB's at .068
Mixture holes at .080

I gets plenty of fuel and air :-)
Cant wait to get the 214/224@050 / 112 lsa cam in there

Cliff Ruggles:
Good news.  It would be nice to know why the other carb was acting up?

I did run into a main casting one time that had a pressure leak between the incoming fuel and bowl, probably porosity and it allowed the fuel level to rise at idle and flood if it sat there long enough idling.  That casting simply may not be any good.....Cliff

Marx3:
I will see if I can find the cause. Like you mention, it must be some sort of main casting defect, since I used the exact same parts to rebuild the 253.
I'll post it in here when I have investigated some.

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