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The fuel injection pump (1) feeds fuel to the high-
pressure fuel manifold (rail) (4). The fuel is at a
pressure of up to 160 MPa (23200 psi). A pressure
sensor (6) in the high-pressure fuel manifold (rail) (4)
monitors the fuel pressure in the high-pressure fuel
manifold (rail). The ECM controls a suction control
valve (2) in the fuel injection pump in order to
maintain the actual pressure in the high-pressure fuel
manifold at the desired level. The high-pressure fuel
is continuously available at each injector (5). The
ECM determines the correct time for activation of the
correct electronic unit injector (5) which allows fuel to
be injected into the cylinder. The leakoff fuel from
each injector passes through an external pipe above
the electronic unit injectors. The leakoff fuel then
flows to a connector block on the left-hand side of the
engine. A pipe is connected from the connector block
in order to return the leakoff fuel to the fuel tank.
Components of the Fuel Injection
System
The fuel injection system has the following
mechanical components:
• Primary filter/water separator
• Fuel transfer pump
• Secondary fuel filter
• Fuel injection pump
• Fuel injectors
• Fuel manifold
• Pressure relief valve
• Fuel pressure sensor
• Fuel temperature sensor
• Water in fuel sensor
The following list contains examples of both
service and repairs when you must prime the
system:
• A fuel filter is changed.
• A low-pressure fuel line is replaced.
• The fuel injection pump is replaced.
For the correct procedure to prime the fuel system,
refer to Systems Operation, Testing and Adjusting,
“Fuel System - Prime”.
Primary Filter/Water Separator
Illustration 19 g02848802
Typical example
The primary filter/water separator (1) is located
between the fuel tank and the fuel transfer pump. The
primary filter/water separator (1) provides a 10 micron
filtration level.
The primary filter/water separator can either be
engine mounted or supplied loose. The primary filter/
water separator is supplied with water in fuel sensor.
The water in fuel sensor has to be connected.
Secondary Fuel Filter
Illustration 20 g02848803
UENR0623 25
Engine Operation
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