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• The supply pump pressurizes fuel and supplies it in a highly pressurized state.
• Fuel drawn from the fuel tank by the feed pump is not supplied directly to the plungers. It is supplied first to the
MPROP (rail pressure control valve), which controls the amount of fuel reaching the plungers.
• If the fuel pressure exceeds a certain level, the overflow valve returns fuel to fuel tank. This operation keeps the
pressure of the fuel constant.
• Rotation of the camshaft causes (via the tappets) up-down movement of the plungers. Fuel in the plunger cham-
bers is thus highly pressurized.
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