Mercury - Fuel Filter Screen Under-Cowl Fuel System Fine Mesh Polymer 87946K04. OverviewThere's a certain comfort that comes from knowing your outboard is being fed clean, dependable fuel every time you hit the water. Anyone who spends their weekends chasing calm mornings or evening tides knows that fuel contamination is one of those hidden problems that can ruin a trip fast. The Mercury 87946K04 Fuel Filter Screen offers the kind of quiet protection you rarely think about-but absolutely rely on