A Series Diesel Engine Fuel System 68
Fuel System
Fuel System Component and Flow
The following illustration identifies the components of
the fuel system.
1. Fuel Injection Pump. 2. Overflow Valve. 3. Fuel Shut-Off
Solenoid. 4. Fuel Injection Nozzle. 5. Fuel Tank.
6. Water in Fuel Sensor (WIF). 7. Fuel Filter. 8. Hand
Priming Pump
Most of the engines will be quipped 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 (21-35kPa, [3-5psi])
to the fuel filter head, through the filter and then to the
distributor injection pump.
The engines use distributor-type fuel pumps supplied
by Robert Bosch.
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 fuel enter the combustion chamber.
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