Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

another idle issue

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canadian nascar:
hey guys,

changed the float level to 15/32 as spec says, and 301garage forum, seems to have more vacuum and I turned out the mixture screws 3.5
a/f is 15.5 idle
vacuum 16
rpm needs to be lowered from 1100 to 800
no nozzle drip now
not puffing fuel and as much gassy stink at idle
running better

later Kevin

Cliff Ruggles:
Good news.  High fuel pressure often requires a lower float setting, and 3.5 turns out with the mixture screws on a later carburetor really isn't very far, especially if you didn't open up the holes under them.

The 110LSA will be a bit "stinky", especially in such a small engine.....Cliff

canadian nascar:
Hi Cliff,

The holley 110gph pump is rated 6.5-8 psi, would a regulator be a good choice and what is the optimum psi for a quad

thank you Kevin

Cliff Ruggles:
It should be fine without a regulator, those later carburetors can easily handle 6-8psi with the .135" inlet seat and stock float......Cliff

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