Abstract: A fuel system for an engine (10) includes a fuel pump (13), a controller (14) which controls the operation of the fuel pump so that fuel is delivered to the engine at the required time and in the desired quantity, and a transducer (15) for supplying a demand signal to the controller. The system also includes a transducer (16) which provides signals in response to the passage of indicia on a wheel (12) driven by the engine. The system further comprises means for determining the indicia spacing errors and further means responsive to the generally sinusoidal fluctuation of engine speed which corrects the determined spacing. errors.

Abstract: A fuel control system for the fuel supply system of a compression ignition engine is arranged so that above a predetermined engine speed and below a predetermined level of fuel supply, fuel supply to the combustion chambers of the engine in turn is prevented. The remaining combustion chambers are arranged to receive an increased fuel supply to maintain the engine power.