TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 221 of 1313
FUEL SYSTEM (SINGLE TANK) OPERATION
Major components of the single tank fuel system are:
A. TANK (REAR) VENT LINE
- Vents vapors from fuel tank to vent hole-in air intake stack.
B. TANK FILLER CAP
- Covers fuel filler opening.
C. FUEL TANK
- Stores fuel for vehicle use.
D. FUEL TANK LEVEL SENDING UNIT
- Electrical signal registers fuel level in tank at gauge on
instrument
panel.
E. TANK (FRONT) VENT LINE
- Vents vapors from fuel tank to vent hole in air intake stack.
F. FUEL FILTER/WATER SEPARATOR
- Filters water and dirt from fuel.
G. FUEL RETURN LINE
- Returns unused fuel back to fuel tank.
H. FUEL PRIMER PUMP
- Purges air from fuel system.
I. FUEL PUMP
- Draws fuel from tank and pumps it through supply line to fuel injectors.
J. FUEL SUPPLY LINE
- Directs fuel from fuel pump to fuel injectors.
J
A
B
C
D
E
F
G
H
I
G0023DAA
Figure 11.
Fuel System (Single Tank) Components.
TM 9-2320-272-23-1
0003
0003-16
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