Perkins 1106C Genset Systems Operation Testing And Adjusting page 21

KENR6931
High Pressure Fuel System
Illustration 21
High pressure fuel system (typical example)
(1) Electronic unit injector
(2) Fuel manifold (rail)
(3) Fuel pressure sensor
The fuel injection pump (7) feeds fuel to the high
pressure fuel manifold (2). The fuel is at a pressure
of 70 MPa (10152.7 psi) to 130 MPa (18855 psi). A
pressure sensor (3) in the high pressure fuel manifold
(2) monitors the fuel pressure in the high pressure
fuel manifold (2). The ECM controls a solenoid (6) in
the fuel injection pump (7) in order to maintain the
actual pressure in the high pressure fuel manifold
(2) 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 (1) 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 pressure side of the fuel transfer
pump.
(4) Fuel pressure relief valve
(5) Fuel transfer pump
(6) Solenoid for the fuel injection pump
Components of the Fuel Injection System
The fuel injection system has the following
mechanical components:
•
Primary filter/water separator
• Fuel priming pump
•
Fuel transfer pump
•
Secondary fuel filter
• Fuel injection pump
•
Fuel injectors
•
Fuel manifold
• Pressure relief valve
•
Fuel pressure sensor
Systems Operation Section
(7) Fuel injection pump
(8) Fuel pump gear
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