PURPOSE: To feed a fuel of optimal value corresponding to a driving condition of an engine by providing a guiding shaft tilted so that a torque cam can be moved not only in the moving direction of a control rack but also vertically to the rack.
CONSTITUTION: When an acceleration pedal is applied in an idle driving condition of an engine, a control rack is moved until an arm point is in contact with a cam surface 24a of a torque cam 24, and the amount of fuel supply is increased. A guiding hole 3a tilted in the horizontal direction is provided on a slider 3 supporting the torque cam 24 provided for controlling the amount of fuel supply under a full load condition of the engine, and a guiding shaft 5 is inserted into the hole. The slider 3 is slid against a spring 9 on the guiding shaft 5 through an interlocking shaft 6 by the operation of a boost compensator 10 at the time when a supercharger is operated during the full load driving and when the inlet pressure is increased thereby, and the cam surface 24a is moved to a low point by moving the slider 3 to a low point while it is laterally slid.