I've got a 15 hp Kohler that powers my Scag mower. When I clean the air filter (everyday) I have noticed that there is a puddle of gas sitting below the air filter. When I start the engine there is a burst of smoke that comes out of the exhaust. After the engine starts the gas is gone. This seams to happen when the mower is stored over night. When I first start the mower it is hard starting most likey from the excess gas. Any ideas if it is a problem or what can I do to fix it. Thanks.