TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 63 of 1207
TM 9-2320-361-20
1-19. POWER SYSTEMS OPERATION (Contd)
c. Fuel System Operation.
The fuel system stores, cleans, and supplies fuel to the fuel injectors where it is mixed with air for
combustion in engine cylinders. Major components of the fuel system are:
PRIMARY FUEL FILTER
- First filter to remove water and dirt from fuel.
FUEL SUPPLY LINE
- Directs fuel from fuel pump in fuel tank to primary fuel filter, to fuel
transfer pump, to secondary and final fuel filters, to fuel injector pump, and then to fuel injectors.
FUEL TANK FILLER CAP
- Covers fuel fill opening.
FUEL LEVEL SENDING UNIT
- Detects fuel level in fuel tank and sends an electrical signal to
fuel gage on instrument panel.
FUEL PUMP
- Draws fuel from fuel tank and pumps it through fuel supply line.
FUEL TANK
- Stores fuel for vehicle use.
FUEL RETURN LINE
- Directs unused fuel back to fuel tank.
VENT LINE
- Allows clean air to enter fuel tank as fuel supply is used up.
FUEL INJECTORS
- Spray a fine mist of fuel into combustion chambers.
FINAL FUEL FILTER
- Removes additional dirt from fuel.
SECONDARY FUEL FILTER
- Removes additional dirt from fuel.
FUEL TRANSFER PUMP
- Forces flow of fuel through secondary and final fuel filters to the fuel
injector pump.
FUEL INJECTOR PUMP
- Furnishes pressurized fuel to the fuel injectors.
1-50
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