ARMY TM 9-6115-639-13
AIR FORCE TO 35C2-3-386-51
MARINE CORPS TM 10155A-13/1
c. As the rotor turns, voltage is induced in the stator windings. The stator voltage output is connected to
the static power inverter / converter (A8). Voltage output can be varied using the VOLTAGE ADJUST rheostat
(R1). Frequency output is not adjustable.
1-20. FUEL SYSTEM. (Figure 1-6)
a. The generator set fuel system (Figure 1-6) consists of a 4.0 gallon (15.1 liter) fuel supply tank, fuel
transfer pumps, fuel filter / water separator, auxiliary fuel intake system, and engine fuel components. The fuel
tank is sized to contain enough fuel to operate the generator set for eight (8) hours at full load using any of the
specified fuels. The tank is connected to a fuel fill pocket, which contains a vented fill cap (4), fuel filler neck,
and fuel strainer (5). A tank drain valve (11) is located at the base of the tank.
b. The engine fuel supply line passes fuel from the fuel tank, through a fuel filter / water separator (13), a
fuel transfer pump (12), and a fuel injection pump (7), into the fuel injector (6). The fuel filter / water separator
removes micro-particles and separates water from the fuel flow. Water collects in the filter / water separator
bowl where it can be drained.
c. The generator set fuel system is equipped with two fuel transfer pumps: primary (12) and auxiliary (1).
The primary fuel transfer pump (12) feeds fuel from the fuel tank to the engine injection system. When the
START / RUN / STOP switch (S1, Figure FO-1) is placed he START or RUN position, the primary fuel transfer
pump is energized. Fuel flows to the fuel injection pump (7, Figure 1-6). The pump provides the pressurized
fuel to operate the fuel injector (6).
d. For generator set operation from an auxiliary fuel source, the auxiliary fuel hose is connected to the set
at the auxiliary fuel connection (2). The AUX FUEL switch (14, located on the control panel) is placed in the
ON position. A three-position float switch (3) monitors tank fuel level and controls auxiliary fuel system
components. If fuel is below float switch FL2B, the auxiliary fuel transfer relay (15) energizes and activates the
auxiliary fuel pump (1). The auxiliary fuel pump will begin operation and draw fuel from the auxiliary source
until the fuel level in the tank rises above float switch FL2A. Once the fuel level rises above switch FL2A, the
switch will open and de-energize the relay (15). The level monitoring / servicing cycle will continue until the
AUX FUEL switch (14) is placed in the OFF position.
e. If, at any time during operation, the tank fuel level drops below float switch FL1, the fault lockout
relay (10) will open and de-energize the governor control (9) and governor actuator (8), cutting off fuel to the
engine. This prevents the fuel system from running dry, causing loss of prime in the fuel injection pump (7).
The NO FUEL indicator on the fault isolation module will illuminate and the generator set will immediately
shut down. Once the fault lockout relay (10) has been actuated, the engine will not run until the FAULT
RESET button on the malfunction indicator module has been depressed.
f. If fuel level drops below float switch FL2B and an auxiliary fuel source is not available, the generator
set will continue to operate for 3 to 4 hours before float switch FL1 is actuated and shutdown occurs.
Change 1
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