Mercury - On-Engine Water Separating Fuel Filter V6 & V8 FourStroke Series Ten-Micron Filtration 8M0106635. Overview. Every boater knows that fuel quality can make or break a day on the water. You can run the best engine Mercury has ever built, but if water or debris sneaks into your fuel system, you'll feel it-hesitation in the throttle, loss of power, or that uneasy sputter none of us want to hear when we're running home ahead of a storm. The Mercury 8M0106635 On-Engine Water Separating Fuel F