The influence of outer passive ferrous yoke construction on the efficiency of the cylindrical electromagnetic induction permanent magnets pump has been investigated with a pump experimental model. The main goal for such studies is to simplify the ferrous yoke as its construction and as the possibility of its assembling/reassembling taking into account rather strong magnetic attraction forces between the ferrous yoke and the magnetic rotor of the pump, especially for more powerful pumps and, correspondingly, at its larger bigger dimensions and very strong integral magnetic attraction forces.