Sierra 18-7845 Fuel Separating Fuel Filter for Sterndrive and Inboard Engines Sierra 18-7845 is a replacement fuel filter for sterndrive and inboard engines including Mercruiser, Mercury, and Yamaha. Sierra canister fuel filters are designed to be an exact fit and performance replacement to your current OEM canister filter. These filters are tested to meet ISO, SAE, and JIS standards. Sierra fuel water separators remove over 99.8 of emulsified water from your gasoline. All filters flow at 90 GPH