Mercury 8M0166596 Water Separating Fuel Filter This Mercury outboard fuel filter is designed to remove water and other impurities from your gasoline. This helps optimizes the performance of your Mercury fuel system. The unique filtration system helps prevent contaminated fuel from causing poor engine performance, stalling, and even damage to your fuel system components. Mercury filters are encased in a metal shell that features a powder coat finish to resist corrosion in fresh and salt water env