To satisfy the starting properties of an engine on a slope, prevent speed variation when the engine is inclined, and prevent the excessiveness and shortage of fuel at rapid starting time and rapid stopping time, by regulating disturbance generated in a centrifugal governor when an on-vehicle engine is inclined, and rapidly started and stopped.

The rack pin 5 of a fuel injection pump 6 is formed to be pushed and pressed on a fuel quantity reducing side L by the governor force G of a governor weight 18 so as to be elastically pressed on a fuel quantity increasing side R by a governor spring 8 through a governor lever 1. A balancer gear 13 having an eccentric load part 13a is vertically swingably arranged in the pump storing chamber of the fuel injection pump 6, and also a rack 12 which is advanced/retreated by being engaged with this balancer gear 13 is arranged therein, and one end of the rack 12 and the swinging end 1c of the governor lever 1 are mutually connected interlockingly through a buffer spring 8. The disturbance swinging of the governor lever 1 is regulated through the rack 12 and the buffer spring 8 by the self-retaining attitude of the balancer 13.