Three Stages Of Injection; Stages Of Injection; Fill Cycle - Ford 6.0L POWER STROKE Service Procedures And General Diagnostics

Three Stages of Injection

• Fill
• Main Injection
• End of Main Injection
SPOOL VALVE
CLOSED
FUEL INLET
PINTLE CLOSED
F U E L M A N A G E M E N T S Y S T E M
INTENSIFIER PISTON
AT REST

Stages of Injection

• The injection cycle has three (3) stages.
• Fill.
• Main injection.
• End of main injection.
• During some conditions the injector will
perform all three steps of the injection cycle
two times per firing cycle. This is called pilot
injection.
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Fill Cycle

• During the fill stage, the spool valve is in the
closed position.
• High pressure oil from the oil rail is dead
headed at the spool valve.
• Low pressure fuel fills the port below the
plunger.
• The needle control spring holds the needle
on its seat so that fuel can not enter the
combustion chamber.
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