Mercury - Water Separating Fuel Filter Kit L6 Verado Series Precision Marine Filtration 8M0103686. Overview. When you run a Mercury L6 Verado, you expect a certain kind of experience-smooth, responsive power and the quiet confidence that your engine is getting the clean fuel it deserves. Nothing derails a day on the water faster than contaminated fuel, and anyone who has battled rough running or lost power offshore knows that feeling all too well. That is why the Mercury 8M0103686 Water Separati