TM 9-6115-730-24
0003
ELECTRONIC UNIT INJECTOR FUEL SYSTEM - Continued
injectors must be replaced, the priming pump can be used to fill the system after draining the fuel supply and
return manifolds. The fuel flows continuously from the fuel supply manifold through the unit injectors and excess
fuel is returned to the fuel tank by the fuel return manifold. A flow regulating orifice is located in the adapter
manifold to maintain sufficient back pressure in the system to fill the unit injectors. Optimal fuel flow is provided to
the unit injectors without excessive fuel tank heating. Each cylinder contains an electronically controlled,
mechanically actuated unit injector. A solenoid on each unit injector controls the amount of fuel delivered by the
unit injector. The ECM sends a signal to each unit injector solenoid, to provide complete control of the engine.
Figure 3. Fuel Supply and Injection.
