Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Throttle plates closed, but still nozzle drip

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Frank400:
The air could be coming from the secondary throttle plates not being 100% closed ?  Like being held a little by the linkage ?

Marx3:
Already double checked that :-)

von:
Just FWIW I once had a big Q jet vacuum leak caused by simply having the carb to intake gasket flipped over.

von:
Also, I've seen bad (leaking vacuum) vacuum advances causing vacuum leaks. I'd plug every vacuum line and the PCV line and try it.

Marx3:
I was thinking there must be a major vacum leak somewhere, but I just can't find it.
I am replacing the intake to carb gasket.

Other than that, I have had everything unplugged, from advance to brakebooster.
With everything unplugged and capped off I tried spraying each vacum stud and cap with brake cleaner. Found nothing.

Car runs great, it just have a slight off idle stumble from all the fuel.
It seems the fuel is being pushed out of the nozzles, rather than sucked ( it is not really physically possible with the throttle completely closed, right... )
So exsessive fuel pressure and/or to high a float level could cause it.
The fuel pump is the original good old mechanical one, tried swapping out the needle/seat assembly and checked the gasket and the sealing area in the carb body. I even tried two different used floats I had lying around, cause I thought the float might be saturated.
None of this helps.

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