•  By controlling the supply pump intake amount, the suction control valve controls the pressure pump feed amount and the pressure inside the fuel distribution pipe.

•  The intake amount is determined by the total opening size of the valve as controlled by the duty value of the solenoid actuation current.

•  The duty solenoid can adjust the open and close time ratio to control the intake amount by changing the ON time during a single cycle. For a normally open type suction control valve, making the duty ratio smaller increases the intake amount and, conversely, making the duty value larger decreases the intake amount.