Denso 4D56 - Operation of the Supply Pump

Operation Section
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3.5 Operation of the Supply Pump
z As shown in the illustration below, the rotation of the eccentric cam causes the ring cam to push Plunger A upwards. Due to the spring
force, Plunger B is pulled in the opposite direction to Plunger A. As a result, Plunger B draws in fuel, while Plunger A pumps it to the
rail.
Q001234E
Plunger A
Ring Cam
Plunger B
Feed Pump