Not quite. Any air trapped in the carburetor, with needle valve open, would return to the gas tank via the fuel line.Moray wrote:It looks like the vent hole simply hasn't been drilled, which will be causing the fuel level in the float chamber to not rise to close the valve, and tank gravity pressure is simply forcing fuel out the drain plug.
Needle valve not closing for some reason, but not from weight of fuel in fuel line.