Q: I think the fuel in my boat’s fuel tank has turned sour over the winter. The engine starts but doesn’t run right or for long, and the fuel filter shows some goop in it. What can I add to the fuel to restore it?
Steve Hess Armonk, New York
A: There is no additive that can restore bad gasoline. From your description, it sounds like the fuel in your boat’s tank has undergone what is sometimes called “phase separation.” This is not an uncommon occurrence thanks to the use of ethanol as an extender in gasoline. I recommend you contact an environmental services company to dispose of the bad gas responsibly. Be sure to drain the boat engine’s fuel system. Replace all filters, then refill with fresh fuel.