MERCURY Element : Boat Fuel Filters - amazon Exactly what I needed to replace my Merc 60 hp 4 stroke outboard motor fuel filter. This filter fits into the existing filter casing, so although it is about the same in price as buying the entire filter assembly, this allows me to just open the existing filter casing to replace the filter.4.2/5(24)Price: 19 Mercury Marine 35-8M0122423 Fuel Filter Element Mercury Marine 35-8M0122423 Fuel Filter Element. This filter fits Mercury outboard engines, namely Optimax® and Verado® outboards that utilize a vapor separator with a top screw type filter. Features: Filter rating: 2 micron filter media. OEM quality. Compatible with ethanol gasoline blends.