I am working on a neighbours truck for him. The engine is a 300 six with the 1 barrel Carter Carb. Not sure of the year cause its a transplant from before he bought it. I rebuilt the carb for him cause it wouldn't start before. Now its running, but its leaking heavily from around the rectangular shaft that runs up through the bowl. I tried playing with the float a little, but nothing seems to work.
Any input would be appreciated.

 

Not familiar with Carter;however, try WWW.apple.queensu.ca/CJ3b/tech/carburetor.html