And don’t forget...
 Check out your fuel filter. A remote water-separating fuel filter, like the easily installed inspection bowl models from Racor, makes it easy to see if there’s water or contaminants in your fuel system.
 While you’re at the batteries, swap out those wing nuts for locknuts, those with the nylon insert, and torque the terminal connections tight so they won’t come loose when you least want them to. Tight terminals ensure best charging.
 Bungs are cone-shaped chunks of wood that you can jam into the pipe portion of a seacock should the hose or valve fail. They can be purchased, or you can fashion them from softwood such as pine or cedar, which swells tight once wet. Hardwood bungs are ill-advised, since these can split fittings.
 Fuel fills, hatches and deck plates all have O-rings that create a watertight seal. Order replacements for any that are abraded, worn or loose.