(2) Supply Pump Internal Fuel Flow a. The fuel that is drawn from the fuel tank passes through the route in the supply pump as illustrated, and is fed into the rail. Supply Pump Interior Regulating Valve Feed Pump Overflow SCV (Suction Control Valve) Pumping Portion (Plunger) Rail Intake Valve Fuel Tank (3) Construction of Supply Pump (in case of HP3 pump) a. The eccentric cam is attached to the cam shaft. The eccentric cam is connected to the ring cam. Q000283E Cam Shaft Eccentric Cam Ring Cam b. As the cam shaft rotates, the eccentric cam rotates eccentrically, and the ring cam moves up and down while rotating. QD0706E Plunger Eccentric Cam Ring Cam Cam Shaft 10 QD0727E