(Supersedes to 8M0235171). Reliable fuel delivery can make or break your engine's 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 it's needed.. Engineered specifically for select Mercury outboards, this module fits seamlessly into the fuel system, with factory-matched connections that eliminate guesswork during installation. Internally, the components work together to deliver smooth fuel flow across the RPM range - no hesitation, no starvation, even under heavy throttle. Built with corrosion-resistant materials, it stands up to saltwater exposure and handles ethanol-blended fuels without breaking down prematurely.. What makes this module essential:. Direct OEM fit for select Mercury outboards - clean installation, n