Wreckfish,
Just spoke with the Yamaha outboard customer service team in Atlanta. Nothing can be done to make the separated fuel useful. Fuel must be drained and gas tank thoroughly cleaned to remove all contamination off the walls of the tank as well as the engine and carbs. They recommend DRAINING ALL FUEL at the end of the season instead of topping off the tank as well as buying smaller amounts during the season so fresh fuel is continually entered into the system. You never know how long the fuel has been sitting at the pump station before you purchase it. Still looking for a better price than original quote. (bob-irish-eis)