TM-9-2320-344-10
TRUCK, CARGO, GUIDED MISSILE TRANSPORTER (GMT), 8X8, M985A4GMT
TECHNICAL MANUAL; OPERATOR'S MANUAL
OCTOBER 2008
TM-9-2320-344-10 - Page 131 of 1012
NOTE
The excess fuel flow also purges the air from the fuel system.
The excess fuel flow that is provided by the transfer pump (1) is used in order to cool the
electronic unit injectors (4).
The fuel from the transfer pump (1) flows through two micron fuel filters (5) at fuel filter base
(6).
Fuel temperature sensor (7) is mounted in the fuel filter base (6).
NOTE
•
The engine control module (ECM) uses the sensor to monitor the
temperature of the fuel that is entering the engine.
•
The information is used by the ECM to calculate a fuel correction
factor during engine operation.
Fuel priming pump (8) is positioned on the fuel filter base (6) in order to prime the system
when air has been introduced into the fuel system.
NOTE
The fuel enters the cylinder head at the front of the engine.
The fuel leaves the fuel filter base (6) and flows through fuel supply line (9) to the cylinder
head.
Fuel is delivered to electronic unit injectors (4) through fuel manifold (10) that is drilled into
the cylinder head during the manufacturing process.
NOTE
Excess fuel exits the cylinder head at the rear.
The fuel returns to the fuel filter base (6) through fuel return line (11) to the pressure
regulating valve that maintains a sufficient amount of back pressure in the system in order
to fill the electron unit injectors (4).
NOTE
After the fuel passes through the pressure regulating valve, the fuel re-
turns to the fuel tank.
The fuel flows continuously from the fuel supply through the electronic unit injectors (4) in
the head and back of the tank.
COOLING SYSTEM
Air is pulled through the air cleaner, and into the air inlet (1) by the low pressure turbocharger
(2).
TM 9-2320-344-10
0012
0012-5
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