onto the frontal cam plate by at least one spring not shown thus the pump piston 7 simultaneously executes rotary and reciprocating motion the number of cam lobes 4 is equal to the number of engine cylinders and to the number of strokes per shaft revolution a portion of the housing 1 is embodied as a distributor head 8 the pump piston 7 moves within a cylindrical bushing 9 closed on top and inserted in the distributor head the bushing 9 is provided with a cylindrical bore 10 and defines a pressure chamber 11 the pump piston 7 has an axial bore 12 which terminates in the pump pressure chamber 11 branching off from the axial bore 12 is a radial bore 13 which terminates in an annular groove 14 in turn connected to a longitudinal distribution groove 15 during the rotation of the pump piston this longitudinal groove 15 establishes individual communication between the pressure chamber 11 and separate individual pressure lines 16 which terminate in the bore 10 and lead to the individual cylinders not shown of the internal combustion engine the pressure lines 16 are distributed uniformly around the bore 10 each of the pressure lines 16 contains a check valve 17 preferably embodied to serve also as a pressure relief valve during each compression stroke of the piston 7 a suitable amount of fuel is delivered through the central bore 12 the transverse bore 13 the annular groove 14 and the distribution groove 15 to one of the pressure lines 16 the housing defines a suction chamber 19 containing engine fuel which is kept at slightly elevated pressure during the suction stroke of the piston 7 fuel flows from the suction chamber 19 via a suction line.