Mercury - Water Separating Fuel Filter High-Efficiency Filtration Marine-Grade Construction 8M0154755. Overview. Any boater who's spent time offshore knows how much trust we put into the heart of our engine's fuel system. Clean fuel isn't just a preference-it's what keeps the day running smoothly. You feel it in the steady rumble at idle and the confident pull when you throttle up. With the Mercury Marine part number 8M0154755 Water Separating Fuel Filter, you're giving your engine the kind of p