PURPOSE: To prevent a restricting position of the max. fuel injecting quantity from being easily changed and adjusted from the outside of an engine in a fuel restricting device for diesel engines.
CONSTITUTION: A movement restricting part 12 is provided to be projected from the inner surface of a fixed wall 2a of a diesel engine E. A subgovernor level 4 is located to face the movement restricting part 12 from the fuel reducing side L to be caught at a movement limiting position M. A sliding part 13 is moved to a main governor lever 3 arranged in the inside of the engine so that it can advance or retract, and a fuel quantity adjusting rack 5 is connected to an interlocked with the sliding part 13. A fixed position adjusting means 14 is provided on the governor lever 3, and the sliding part 13 is adjusted to be advanced or retracted by the fixed position adjusting means 14 to be fixed to the main governor lever 3.