I smell gas after I turn my bike off and it sits in the garage for a while. I have checked the carb and all hoses and no leaks. Makes no diff how much gas is in the tank.

 

If you don't turn off the fuel valve, you might try turning it off with the engine running about a minute before you pull into the garage. There is a possibility the fuel valve is sticking open allowing seepage into the carb / crankcase. Other than that, I'd be out of ideas.