TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 57 of 481
TM 9-2320-272-10
1-40
1-18. POWER SYSTEM OPERATION (Contd)
c. Fuel System (Single Tank) Operation.
Major components of the fuel system (single tank) are:
TANK (REAR) VENT LINE
– Vents vapors from fuel tank to vent hole in
air intake stack.
TANK FILLER CAP
– Covers fuel fill opening.
FUEL TANK
– Stores fuel for vehicle use.
FUEL TANK LEVEL SENDING UNIT
– Electrical signal registers fuel
level in tank at gauge on instrument panel.
TANK (FRONT) VENT LINE
– Vents vapors from fuel tank to vent hole in
air intake stack.
FUEL FILTER/WATER SEPARATOR
– Filters water and dirt from fuel.
FUEL RETURN LINE
– Returns unused fuel back to fuel tank.
FUEL PUMP
– Draws fuel from tank and pumps it through supply line to
fuel injectors.
FUEL SUPPLY LINE
– Directs fuel from fuel pump to fuel injectors.
FUEL PRIMER PUMP
– Purges air from fuel system.
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