Gas leak from Zenith carb vent hole

[rfincher]

I have a major leak at the air vent. When I take the carb apart - no apparent warp, good gasket. I can stop the flow of gas with the float valve with pressure from my finger. Float appears to be at correct 5/8" height.

Can't see the innerworkings of the float valve. Are the float valves originally equipped with a rubber tip to easily seal? My float valve "sounds" all metal.