I'm not quite sure which engine your refering to but if it is a YS you can't flood the carb during fueling and if it is another unpumped engine I have an OS 120 in my Venus II fully inverted and the carb is BELOW the center line of the tank. I close the throttle, fill the tank through the "T" fitting and even though there is some fuel dripping from the carb during this process it NEVER floods the engine. As a matter of fact what little fuel does get into the engine assists me because I never have to prime the engine. Fuel, flip and go.