Operation Section
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(4) Supply Pump Operation
Supply Pump Overall Fuel Flow
• The fuel is suctioned by the feed pump from the fuel tank and sent to the SCV. At this time, the regulating valve adjusts
the fuel pressure to below a certain level. The fuel sent from the feed pump has the required discharge quantity ad-
justed by the SCV, and enters the pump unit through the suction valve. The fuel pumped by the pump unit is pumped
through the delivery valve to the rail.
Operation
• The discharge quantity is controlled by the SCV. As with the HP3, the valve opening is adjusted by duty ratio control.
The only difference from the HP3 is the shape of the pump unit. Operation and control are basically the same. For
details on operation and control, see the explanation of the HP3.
Q000853E
Feed Pump from Fuel Tank (Suction)
SCV from Feed Pump (Low Pressure)
Pump Unit from SCV (Low-Pressure Adjustment Complete)
From Pump Unit to Rail (High Pressure)
From Fuel
Tan k
To Rail
Plunger
Suction Valve
Delivery Valve
Ring Cam
Camshaft
SCV
Feed Pump
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