Perkins 1204F-E44TA Systems Operation Testing And Adjusting page 43

UENR4490-01
High Pressure Fuel System
Illustration 34
Typical example
(1) Fuel injection pump
(2) Fuel temperature sensor
(3) Suction control valve for the fuel injection
pump
The fuel injection pump (1) feeds fuel to the high-
pressure fuel manifold (rail) (6). The fuel is at a
pressure of 200 MPa (29000 psi). A pressure sensor
(4) in the high-pressure fuel manifold (rail) (6)
monitors the fuel pressure in the high-pressure fuel
manifold (rail) (6). The ECM controls a suction control
valve (3) in the fuel injection pump (1) in order to
maintain the actual pressure in the high-pressure fuel
manifold (6) at the desired level. The high-pressure
fuel is continuously available at each injector. 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 into a drilling which runs along
the inside of the cylinder head. A pipe is connected to
the rear of the cylinder head 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
This document has been printed from SPI2. NOT FOR RESALE
(4) Fuel pressure sensor
(5) Electronic unit injector
(6) Fuel manifold (rail)
(7) Pressure relief valve
• Electric transfer pump
• Fuel transfer pump
• Secondary fuel filter
• Fuel injection pump
• Fuel injectors
• Fuel manifold
• Pressure relief valve
• Fuel pressure sensor
• Fuel temperature 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.
Engine Operation
(8) Fuel transfer pump
43
g02450116