Mercury - Quicksilver Water-Separating Fuel Filter Kit Replacement Kit for Outboards & MerCruiser Engines 802893Q4. Overview. Protect your engine's performance and fuel system with the Mercury Marine 802893Q4 Quicksilver Water-Separating Fuel Filter Kit. This OEM replacement kit is designed to remove water, debris, and other contaminants from your fuel before they reach the engine - preventing corrosion, clogging, and power loss. Suitable for Mercury, Mariner, and Force outboards, as well as Mer