TM 9-6115-729-10
100 kW TACTICAL QUIET GENERATOR SET
0003 00
THEORY OF OPERATION Continued
FUEL SYSTEM Continued
The fuel system consists of hoses, steel injector piping, fuel tank, fuel filter/water separator, transfer pump, injection
pump and injectors. Fuel is drawn from the fuel tank by the transfer pump. Fuel passes through a fuel filter/water
separator where water and small impurities are removed before arriving at the engine fuel transfer pump. The fuel is then
pushed through the secondary fuel filter that removes even smaller particles from the fuel. The fuel then enters the
injector manifold and goes into the injectors which are controlled by the ECM and actuated by a hydraulic injection pump
that is part of the high pressure oil system. Through the injectors fuel enters the diesel engine combustion chamber,
where it is mixed with air and ignited. The fuel that is not used is cooled and returned to the fuel tank via an excess fuel
return line. When the fuel level is low, the fuel level switch will either supply power to the external auxiliary fuel pump
for external fuel supply or shut down the TQG to prevent it from completely running out of fuel. If a diesel engine runs
out of fuel, it is necessary to fill the fuel filters, purge all air from the lines and pumps, and bleed all injectors, one at a
time. Only hydraulic pressure will open the injectors; air pressure will not.
AUXILIARY FUEL PUMP
The auxiliary fuel system consists of an external fuel supply, fuel filter, piping, a 24 Vdc auxiliary fuel pump and a fuel
level float switch. When the EMCP AUX FUEL switch is ON, auxiliary fuel pump can transfer fuel from the external
fuel supply to the generator fuel tank. The fuel level float switch shuts off the auxiliary fuel pump when the generator fuel
tank is full and reactivates the pump as the level drops. The fuel level indicator indicates fuel level of generator fuel tank
from empty (E) to full (F).
0003 00-3
