a supply pump for a common rail fuel injection system applicable to a multi - cylinder engine , that exerts a smaller load on a drive power transmission mechanism connecting the engine to the supply pump . to this end , fuel delivery timing of the supply pump is optimized . the number of engine cylinders may be different from that of fuel delivery of the supply pump . a first fuel delivery end timing is 30 °± 5 ° after compression top dead center of # 1 cylinder , and subsequent fuel delivery end timings come at constant intervals . the constant intervals are obtained by dividing 720 ° by the number of fuel delivery per two rotations of an engine crankshaft .