Since new have always had a slight amount of fuel leaking into the carb air box after shutdown.After 24 hours engine starts even in cold weather the engine starts with no priming.A light spray of fuel is evident on the aircraft undersuface after flight..If the engine is shutdown turning off the fuel cock,none of this happens.Several times recently when I turn on the fuel cock there is a constant flow of fuel through the carburetor.This carb is has done 100 hrs from new.Engine from aerosport power.Ideas please.Thanks,Ron.