Mercury - Quicksilver 8M0204703 Water Separating Fuel Filter Disc Gen III Fuel Cooler System Marine-Grade Composite 8M0204703. Overview. Anyone who's spent long days on the water knows how important clean, reliable fuel flow is to a smooth-running engine. There's a certain comfort that comes from knowing your fuel system is protected that no matter the conditions, your engine will breathe clean and run steady. This Mercury Marine part brings that same peace of mind. Whether you're drifting along