1965 289 carburetor problem

[erndog72]

I just rebuilt my autolite carburetor and have a problem. The engine is running very nicely, however, when I take it above an idle, the vent hole for the float bowl starts to issue gas. At first I noticed it with the air cleaner off and thought it was just sucking to much vacuum nearby, but with the air cleaner on I can still see gas coming down the side of the carburetor when I increase the rpm. I have readjusted the float to a lower setting and it is not the brass float that could leak and sink. I also pulled the needle valve and seat to look for debris that may have lodged in it. Nothing there. Besides, if there was debris under the valve the vent would probably leak even at an idle.

Ideas??

[eggfarmer]

I had this trouble once before, turned out to be a bad gasket seal.

[erndog72]

Which gasket?

[erndog72]

Figured it out!
Thought maybe the fuel pump was over pressurizing due to being gummed up, but that didn't change anything but my wallet and pride. Finally realized that the float hinge pin sits in a recess that has a considerable vertical gap. When the top of the carburetor is installed the float still has room to rise. Therefore the float could not pivot enough to shut the needle valve. Rebent the tab and voila!! It works like a champ.

[KimMG]

Thanks for sharing your solution. It is this kind of sharing that makes forums like this one work.