Mercury - Fuel supply module - 8M0158586 (Supersedes to 8M0235171)(Supersedes to 8M0235171) Reliable fuel delivery can make or break your engines performance and the Mercury Marine Fuel Supply Module 8M0158586 is built to keep that flow steady, even in the toughest marine conditions. This all in one assembly manages multiple critical functions, from fuel pressure regulation to filtration, ensuring clean, pressurized fuel reaches the engine exactly when and how its needed. Engineered specifically for select Mercury