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 55 of 481
TM 9-2320-272-10
1-38
b. Fuel System (Dual Tank) Operation.
(1) The fuel system stores, cleans, and supplies fuel to the fuel injectors where it
is mixed with air to initiate engine combustion.
(2) The fuel system is not identical for all models. Vehicles covered in this manual
have either one or two tanks. These tanks can also differ in capacity. See table 1-6,
Capacities for Normal Operating Conditions, for these differences.
(3) A typical two-tank fuel system is described below. A single tank is described
later in paragraph 1-18c. Both systems include fuel supply, return, and vent lines to
provide fuel flow and release the fumes throughout the system. Major components of
fuel system (dual tank) are:
1-18. POWER SYSTEM OPERATION (Contd)
RIGHT TANK (FRONT) VENT LINE
– Vents vapors from fuel tank to vent
hole in air intake stack.
RIGHT TANK FILLER CAP
– Covers fuel filler opening on right fuel tank.
B
A
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