TM 5-2410-241-23-1
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FUEL SYSTEM CONTINUED
End of Injection
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Injection is continuous while the injector plunger moves in a downward motion and the energized solenoid holds
the poppet valve closed. When injection pressure is no longer required, the engine ECM stops current flow to the
solenoid. When the current flow to the solenoid stops, the poppet valve opens. The poppet valve is opened by the
fuel injector spring and the fuel pressure. High pressure fuel can now flow around the open poppet valve and into
the fuel supply passage. This results in a rapid drop in injection pressure. When the injection pressure drops to
approximately 3,500 psi (24,132 kPa), the nozzle check closes and injection stops. This is the end of injection.
Figure 10. End of Injection.
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