Mercury - Water Separating Fuel Filter Engine Protection Component High-Efficiency Filtration 8M0126144. Overview. If you've spent any time offshore or running long stretches of inland water, you know how quickly fuel quality can change. A little water in the tank, a bit of debris kicked up from a choppy day - it all finds its way toward your engine. That's why a good fuel filter isn't just a maintenance item; it's peace of mind. The Mercury 8M0126144 Water Separating Fuel Filter delivers that q