Vacuum leak between carburetor and intake manifold?
I have a 1966 ford f100 with a 390. After taking off the carb to clean it, I noticed a rough idle and fuel leaking from between the carburetor and intake manifold. So I replaced the gasket with a gasket specifically for Holley carburetors, but that didn't stop the leak. Any ideas? Would there be any reason the manifold or bottom of the carb would need to be resurfaced? Is sealant ever used?
Spray Carb. Cleaner with a Nozzle Extention on the Manifold ( cold Engine ). The RPM will Increase in Area of Leak… Light Sealant on gasket.Manifold can Warp Out…
There's more than one type of gasket for a Holley. You must get one that matches the manifold AND the carb.
Did you take the carb apart? Anyway, the bowl is filling up too much with gas causing the rough idle and gas leaking from the bottom. Either the floats are set too high, or more probably, there's rust or crud of some kind on the needle & seat causing gas to over fill the bowl and spill down the carb barrels. Then leaking so you could see it.
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