Marine and Boat Fuel Filters in Canada The Racor SNAPP filter can be installed in the fuel line between the tank and the engine. The filter “snaps” into its mounting bracket and the quick-connect fittings allow for fast connection to fuel lines. 10 Micron element captures more contaminants than a 30 micron element and is more effective at stopping the water. Marine Fuel Filter Water Separator – Racor Spin-on Series Racor Marine Spin-on Series Fuel Filter Water Separators use Aquabloc® media to reliably remove dirt and water from diesel and gasoline. Aquabloc® media is pleated, corrugated, and arranged for high water rejection and long service life.