This manual covers the Mercury Mercruiser Gen III Cool Fuel system, a critical component for various Mercruiser engines. It provides detailed information for models equipped with Multi-Point Fuel Injection (MPI), including the 5.0L, 350 MAG MPI, 6.2L MPI, and 496 MAG sterndrive and inboard engines. The engineering behind these systems ensures reliable performance and efficient operation, making them a trusted choice for marine applications. This supplement is designed to complement existing documentation for Mercruiser #30 and #31 series. The purpose of this comprehensive Service Repair Manual is to assist owners, mechanics, and technicians in understanding, maintaining, and repairing the Gen III Cool Fuel module and associated systems. It includes essential sections on general information, maintenance, detailed procedures for removal, disassembly, assembly, and installation of the Gen III Cool Fuel module, as well as troubleshooting and repair guidance for the fuel system and cooling system. Flow diagrams are also provided to aid in diagnosis and repair.