how i can fix my kenmore carpet cleaner, model 175.7817780?

the carpet cleaner will not pump up the cleaning solution. i have checked out the pump motor and it seems to be working well, it has two speeds and it turns well when it is powered on.
i took the pump apart and all it is is a stationary magnet in a plastic housing with holes around it, whith a magnet connected to the motor, this one rotates around the stationary magnet.the inlet hole and the outlet hole of the pump are clean and open. when i put water in the solution tank, and turn the power to the pump on, no water is pumped out of the outlet hole. the motor is in excellent condition, and i haven't been able to figure out why it won't pump.it is a strange pump, it seems to work with magnetic pulses or vibrations.
your help would be appreciated. thank you.