Indmar Marine Water/Fuel Separator Filter | Part #636127 Recommended for all 6.2L Ford based engines with spin-on Fuel H2O separating fuel filters Protect your Indmar engine from water contamination and fuel impurities with this genuine Indmar water/fuel separator filter. One of the most important — and most overlooked — maintenance parts on any marine engine. Water in your fuel system can cause misfires, rough running, corrosion, and in severe cases complete engine failure. This filter is your first line of defence. Compatible with: Indmar marine engines fitted to Malibu, Axis, Moomba, Supra, MB, and Tige boats.