TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 47 of 1015
TM 9-2320-272-24-l
1-21. POWER SYSTEM OPERATION (Contd)
Key Item and Function
1
RIGHT TANK (FRONT) VENT LINE
- Vents vapors from fuel tank to vent hole in air intake
stack.
2
RIGHT TANK FILLER CAP
- Covers fuel filler opening on right fuel tank.
3
RIGHT FUEL TANK
- Stores fuel for vehicle use.
4
RIGHT TANK FUEL RETURN LINE
- Returns unused fuel back to fuel tank.
5
RIGHT TANK (REAR) VENT LINE
- Vents vapors from fuel tank to vent hole in air intake stack.
6
RIGHT TANK FUEL SUPPLY LINE
- Directs fuel from tank to fuel filter.
7
RIGHT TANK FUEL LEVEL SENDING UNIT
- Electrical signal registers fuel level in right tank
at gauge on instrument panel.
8
LEFT TANK FUEL LEVEL SENDING UNIT
- Electrical signal registers fuel level in left tank at
gauge on instrument panel.
9
LEFT TANK FUEL SUPPLY LINE
- Directs fuel from tank to fuel filter.
10
LEFT FUEL TANK
- Stores fuel for vehicle use.
11
LEFT TANK (REAR) VENT LINE
- Vents vapors from fuel tank to vent hole in air intake stack.
12
LEFT TANK FILLER CAP
- Covers fuel filler opening on left fuel tank.
13
LEFT TANK FUEL RETURN LINE
- Returns unused fuel back to fuel tank.
14
LEFT TANK (FRONT) VENT LINE
- Vents vapors from fuel tank to vent hole in air intake stack.
15
FUEL SELECTOR VALVE
- Manual control valve that opens fuel flow to engine from left or right
fuel tank.
16
FUEL FILTER/WATER SEPARATOR -
Filters water and dirt from fuel.
17
FUEL FILTER-TO-PUMP SUPPLY LINE
- Directs fuel from fuel filter to fuel pump.
18
FUEL RETURN LINE
- Returns unused fuel back to fuel tanks.
19
FUEL SUPPLY LINE
- Directs fuel from fuel pump to fuel injectors.
20
FUEL PUMP
- Draws fuel from tank(s) and pumps it through supply line to fuel injectors.
21
FUEL PRIMER PUMP
- Purges air from fuel system.
1-37
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