How much gas? If it is a significant amount, it is not normal and the float or float valve are not doing their job. However, if we are talking about a bit of gas, like overnight, that borders on “normal” and “fact of life” and is because the float valve can’t be relied on as 100% perfect. For that reason, you should loosen the gas cap when shutting down for the day, Besides, that hiss when you loosen the cap is a very satisfying climax to a good day on the water.
