Mercury - Water Separating Fuel Filter Fuel Protection Series Metal Canister 8M0157616. Overview. There's a certain kind of peace that settles in when you know your engine is protected from the things you can't see. Any boater who's spent real time on the water knows that fuel can be unpredictable - clean one day, questionable the next. That's why having a filter you trust makes such a difference. The Mercury Marine part 8M0157616 Water Separating Fuel Filter feels like one of those quiet allies