Mine is doing same thing... starts and runs... then a large amount of oil or gas come through the small tube in the carb... with a gush of gas and oil///i replaced head gasket... same trouble...

15hp Briggs Vanguard... starts and runs... then a large amount of oil or gas come through the small tube in the carb... with a gush of gas and oil///i replaced head gasket... same trouble...
Any solutions??

Hi,
The head gasket was a good guess. At any rate there is outside atmosphere getting into the crankcase and causing a pressure imbalance.
Peace,
Clarke