Operation Section
1
–
18
3.2 HP2 Type
(1) Construction and Characteristics
• The supply pump is primarily composed of the two pumping mechanism (inner cam, roller, two plungers) systems,
the SCV (Suction Control Valve), the fuel temperature sensor, and the feed pump (vane type), and is actuated with
half the engine rotation.
• The pumping mechanism consists of an inner cam and a plunger, and forms a tandem configuration in which two sys-
tems are arranged axially. This makes the supply pump compact and reduces the peak torque.
• The quantity of fuel discharged to the rail is controlled by the fuel suction quantity using SCV (Suction Control Valve)
control. In order to control the discharge quantity with the suction quantity, excess pumping operations are eliminated,
reducing the actuation load and suppressing the rise in fuel temperature.
Regulating Valve
Plunger
Feed Pump
Inner Cam
Roller
Fuel Temperature Sensor
Delivery Valve
SCV
(Suction Control
Valve)
Check Valve
Overflow
Fuel Suction (From Fuel Tank)
Q000818E
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