First, step up filtration in the fuel system. To prevent problems, run the fuel tank as low as possible and, if it is feasible, have it cleaned before switching over to E10 fuel. (E10 can also break down fiberglass resin-pre-1985-and older plastic tanks, so fuel-tank replacement may be necessary.) Check and replace your boat's fuel filters often. While some fuel-injected engines have 28-micron filters, they may need ten-micron filters to protect the injectors. Yamaha has rolled out a line of ten-micron filters with high flow rates-up to 90 gallons per hour-designed to take on E10 problems (see "Injector Protector," right).