Mercury - Remote-Mount Water-Separating Fuel Filter Kit For Outboards & MerCruiser Engines 802893A4. Overview. Keep your fuel clean and your engine running strong with the Mercury Marine 802893A4 Remote-Mount Water-Separating Fuel Filter Kit. This complete kit includes everything you need to install or service a remote-mounted fuel filter - providing a first line of defense against water and debris before it reaches your engine. Designed for use with most Mercury outboards and MerCruiser engines