Re: Kicker Engine Fuel Tank
I use plastic tanks & always left 'em open except when carrying them around - all kinds of weather, never had a problem. Fuel sometimes seeps out the fittings if I close the vent and the temp rises. Steel tanks can hold the pressure, though.
An answer to a question you didn't ask...those steel tanks will start to rust after 35 years or so, just from the moisture in the fuel - I never tried to find a solution but I bet there is one.