Mercury-Inline Water Separating Fuel Filter High-Capacity Filtration Marine-Grade Construction 8M0154756. Overview. When you spend enough days on the water, you learn that clean fuel is more than a maintenance item-it's the heartbeat of a smooth-running engine. There's a calm that settles in when you know your motor is feeding on clean, dry fuel, especially when the wind is up or you're running long stretches between coves. The Mercury Marine part number 8M0154756 Water Separating Fuel Filter br