TM10-3950-672-24-2
Fuel System Components And Flow
The following illustration identifies the components of the fuel system.
Most of the engines will be equipped with a cam-actuated lift pump. Fuel flow begins as the lift pump pulls fuel from the
supply tank. The pump supplies low-pressure fuel (21-35 kPa, [3-5 psi] ) to the fuel filter head, through the filter and then
to the distributor injection pump.
The engines use distributor-type fuel pumps supplied by Lucas CAV.
The distributor pump builds the high injection pressures required for combustion, and routes the fuel through individual
high-pressure fuel lines to each injector.
When the high-pressure fuel reaches the injector, the pressure lifts the needle valve against the spring tension to let the
Any leakage past the needle valve enters the fuel drain manifold. The fuel drain manifold routes controlled venting from
the distributor injection pump and leakage from the injectors back into the fuel tank.
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