TM 10-3950-672-24-2
Carbon build up in the orifices in the nozzle will also
cause low power from the engine. Remove and check
the spray pattern or replace the injectors.
Fuel Drain Manifold
The fuel system is designed to use fuel to cool and
lubricate the injection pump and injectors. Fuel is
continually vented from the injection pump and a small
amount of fuel leaks by the injector needle valve during
injection. This fuel is returned to the supply tank by the
fuel drain manifold.
Restriction of the fuel drain manifold can affect the
Lucas CAV DPA injection pump metering controls and
the operation of the injectors. Restricting the fuel drain
manifold raises the case pressure of the injection pump
which can prevent injection.
If the engine will restart after a waiting period following
an unexplained shut down, look for a restriction of the
manifold drain line.
Note: Restriction can cause the fuel temperature to
rise reducing power from the engine.
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