Thinking back I recall that Marvel Schlebler and Tillotson semi updraft carburetors on Continental stationary engines had a weep hole at the 90* turn upward to allow for fuel bleeding past the needle valve to run out instead of flooding the engines. There was a shut off valve at the tank and the operators who used them indoors must have shut off the fuel when not in use. Design engineers back in the 20s saw to it that a minor carburetor failure wouldn’t destroy an engine. Those carburetors were on everything from Model As to most farm tractors and stationary engines from the late 20s and are still on the Teledyne-Continental engines sold today.