Dago,

Those screws are your carb bowl drain screws. If gas is leaking out from one of them try tightening that allen screw. Loosening either of them with the fuel petcock on will allow all of the gas to run out of the drain. Maybe just one of them is loose?

Backporch790

"The only way to break a bad habit was to replace it with a better habit." Jack Nicholson