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 56 of 481
TM 9-2320-272-10
1-39
RIGHT FUEL TANK
– Stores fuel for vehicle use.
RIGHT TANK FUEL RETURN LINE
– Returns unused fuel back to fuel
tank.
RIGHT TANK (REAR) VENT LINE
– Vents vapors from fuel tank to vent
hole in air intake stack.
RIGHT TANK FUEL SUPPLY LINE
– Directs fuel from tank to fuel filter.
RIGHT TANK FUEL LEVEL SENDING UNIT
– Electrical signal registers
fuel level in right tank at gauge on instrument panel.
LEFT TANK FUEL LEVEL SENDING UNIT
– Electrical signal registers
fuel level in left tank at gauge on instrument panel.
LEFT TANK FUEL SUPPLY LINE
– Directs fuel from tank to fuel filter.
LEFT FUEL TANK
– Stores fuel for vehicle use.
LEFT TANK (REAR) VENT LINE
– Vents vapors from fuel tank to vent
hole in air intake stack.
LEFT TANK FILLER CAP
– Covers fuel filler opening on left fuel tank.
LEFT TANK FUEL RETURN LINE
– Returns unused fuel back to fuel tank.
LEFT TANK (FRONT) VENT LINE
– Vents vapors from fuel tank to vent
hole in air intake stack.
FUEL SELECTOR VALVE
– Manual control valve that opens fuel flow to
engine from left or right fuel tank.
FUEL FILTER/WATER SEPARATOR
– Filters water and dirt from fuel.
FUEL FILTER-TO-PUMP SUPPLY LINE
– Directs fuel from fuel filter to
fuel pump.
FUEL RETURN LINE
– Returns unused fuel back to fuel tanks.
FUEL PUMP
– Draws fuel from tank(s) 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.
U
T
S
R
Q
P
O
N
M
L
K
J
I
H
G
F
E
D
C
1-18. POWER SYSTEM OPERATION (Contd)
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