Operation Section
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(3) Component Part Functions
Feed Pump
• The trochoid type feed pump, which is integrated in the supply pump, draws fuel from the fuel tank and feeds it to the
two plungers via the fuel filter and the SCV (Suction Control Valve). The drive shaft actuates the outer/inner rotors of
the feed pump, thus causing the rotors to start rotating. In accordance with the space that increases and decreases
with the movement of the outer and inner rotors, the feed pump draws fuel into the suction port and pumps fuel out
the discharge port.
Regulating Valve
• The regulating valve keeps the fuel feed pressure (discharge pressure) below a certain level. If the pump speed in-
creases and the feed pressure exceeds the preset pressure of the regulating valve, the valve opens by overcoming
the spring force in order to return the fuel to the suction side.
Component Parts Functions
Feed Pump Draws fuel from the fuel tank and feeds it to the plunger.
Regulating Valve Regulates the pressure of the fuel in the supply pump.
SCV (Suction Control Valve) Controls the quantity of fuel that is fed to the plungers.
Pump Unit Eccentric Cam Actuates the ring cam.
Ring Cam Actuates the plunger.
Plunger Moves reciprocally to draw and compress fuel.
Delivery Valve Prevents reverse flow from the rail of the fuel pumped from the plunger.
Fuel Temperature Sensor Detects the fuel temperature.
To Pump Chamber
From Fuel Tank
Outer Rotor
Inner Rotor
Suction Port
Discharge Port
Q000770E
Bushing
Piston
Spring
Plug
Feed Pump
SCV
Pump Housing
Q000837E
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