HP4 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 adjusted 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.

• 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.

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