Mercury - Water-Separating Fuel Filter Kit Verado L6 Series Vessel-Mounted Filtration 8M0114618. Overview. Any boater who's spent long days offshore knows how quickly a great run can sour when moisture sneaks into the fuel system. It steals power, roughens the idle, and chips away at the confidence you count on every time you turn the key. The Mercury 8M0114618 Water-Separating Fuel Filter Kit is built to restore that confidence. It's the kind of part you install once and instantly appreciate -