Well, I pulled the pump. I noticed it was very hot, even tough it was not working, it had a hum to it. Not the desudising thing. No debris inside the impeller area, however, when I try to turn it, it is like an old air craft magneto, there is a spring like resistance to it for approximately 90 degrees, then it goes forward for another 90 degrees same thing. I work with digital motors which have 360 points to it and it's easy to tell when it's shot. Are these supposed to turn 360 degrees with no bumps or no?