Mercury - Fuel Filter Element Inline / Under-Cowl Filtration Two Micron Protection 8M0122423. Overview. Every boater has felt it-the way an engine hesitates for half a second and your stomach drops right with it. Most of the time it is not something major. It is just fuel that is not as clean as your engine deserves. When you spend your weekends on the water, you learn quickly that dependable power is not just about horsepower; it is about consistency, smoothness, and trust. That is why a solid