Abstract: A force motor includes an electromagnetic rotary actuator and a governor cup for use in the fuel system of an internal combustion engine to permit a desired fuel flow to pass to the engine. The rotary actuator includes a cylindrical housing over which two coils are wound. The magnetic field generated by applying direct current to the coils interacts with a permanent magnet rotor field to rotate an output shaft against the biasing force of a return spring. A governor cup includes a magnet permitting magnetic engagement of the fuel rod to the governor cup. The rotation of the output shaft is translated into linear movement of the fuel rod by a linkage. The rotary actuator has constant output torque characteristics for a given current level to permit the fuel rod to be correctly positioned for the desired fuel flow.