[Kenth]

I have seen 2-Jets where the seal between airhorn and floatbowl is lost due to owner using "gorilla arms" at the aircleaner wing nut, bending the airhorn out of shape.
When this happens fuel will spill over the edge of float bowl into the venturies at acceleration, more with nose up.

With a propane torch and a shop press you may put the airhorn back in shape.