Mercury - Water Separating Fuel Filter High-Horsepower Outboard Fuel Protection 10-Micron Contaminant Removal 8M0166596. Overview. When you run a Mercury Racing engine or a V12 Verado, every detail matters. These engines aren't just powerful - they're refined, responsive and built to deliver reliable speed across long stretches of open water. And nothing disrupts that performance faster than contaminated fuel. With today's fuel blends and moisture-rich marine environments, having a dependable wa