TM 9-2320-280-20-1
1-19. FUEL SYSTEM OPERATION
The HMMWV diesel fuel system operation is identical for all models covered in this manual. It stores,
cleans, and supplies fuel for the engine. Major components of the fuel system are:
FUEL PUMP - Draws fuel from fuel tank through the supply line and pumps it to the fuel filter.
FUEL RETURN LINE - Directs unused fuel from the injection pump back to the fuel tank.
FUEL SUPPLY LINE - Directs fuel from fuel tank to the system.
FUEL TANK – Stores 25 gallons of diesel fuel.
FUEL FILLER CAP - Located at right rear side of vehicle, the cap is removed to permit fuel tank
servicing.
FUEL INJECTORS - Receive metered fuel from the injection pump and sprays fuel into the
combustion chamber.
FUEL FILTER/WATER SEPARATOR- Filters water and sediment from fuel before fuel enters
the injection pump.
INJECTION PUMP - Directs metered and pressurized fuel to the eight injector nozzles. It is
mounted on top of the engine under the intake manifold.
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