What kind of connection is that on the carburetor?
Should there be a hose or something connected there? Gasoline is leaking from the overflow hose on my carburetor, and we just don't know what's causing it. We've taken it apart at least 10 times, checked it, cleaned it, etc. The needle valve should be fine, too.
When Sprit runs out of the overflow hose, something with the float is not okay. Pot torn, valve broken, mechanism jammed. Something like that.