FUEL SYSTEM CONTINUED
When the plunger reaches the bottom of the barrel, fuel is no longer forced from the plunger cavity. The plunger is
pulled up by the tappet and the tappet spring. The upward movement of the plunger causes the pressure in the
plunger cavity to drop below fuel supply pressure. Fuel flows from the fuel supply passage around the open poppet
and into the plunger cavity as the plunger travels upward. When the plunger reaches the top of the stroke, the
plunger cavity is full of fuel and fuel flow into the plunger cavity stops. This is the beginning of pre-injection.
Figure 11. Fill.
END OF WORK PACKAGE