Abstract: A motor is secured to a housing by securing bolts. These bolts are threaded into screw-threaded holes formed in the housing so as to be parallel to an axis of rotation of a motor driven shaft, which drives radially reciprocal plungers that are disposed in diametrically opposed pump bores located on either side of the shaft. The screw-threaded holes are arranged close to, but offset from, the pump bores so that extrapolations of the screw-threaded holes do not intersect the pump bores or cavities in which pressure pulsation dampers or reservoirs are defined, enabling the housing to be small and low in vibration and noise.