Operation Section
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(5) Supply Pump Operation
Supply Pump Overall Fuel Flow
• 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. Fuel sent to the feed pump has the required discharge quantity adjusted by
the SCV and enters the pumping mechanism through the check valve. The fuel pumped by the pumping mechanism
is pumped through the delivery valve to the rail.
From Fuel Tank
Feed Pump
Plunger
Cam
Head
SCV2
Check Valve 1
Check Valve 2
SCV1
To Rail
Delivery Valve
To Tank
Overflow Orifice
Regulating Valve
Q000832E
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