To stir things up Pierce also asked Kevin Falvey, our senior technical editor, his advice. Kevin’s procedure was markedly different. He runs the tank close to empty before storage. In the friendly wrestling match that ensued, Kevin sent me the Mercruiser maintenance manual — straight from the shoulder. It supported his position of running the tank low for storage so that, if the gas is contaminated by condensation, there is less fuel to dispose of. And moisture contamination is always a risk as long as fuel tanks are open to the atmosphere.