The fuel system on the 2001–2002 5.9 Cummins Marine engine delivers diesel from the tank to the injectors. It uses a lift pump to draw fuel and a high-pressure injection pump to supply the engine. Fuel filters remove contaminants and water before fuel reaches critical components. The system maintains precise pressure to ensure efficient combustion. Components resist corrosion and wear from saltwater and constant use. Regular maintenance supports consistent engine performance and reliability.