I had an xp2 sitting for a little while and today I cleaned it out real nice and re-ran the hoses. Primed beautifully, but when I plugged it in I couldn't get it to pump. I can feel a slight vibration coming from it indicating the motor is working (I think), but the impeller doesn't seem to be working. I checked the impeller again to make sure it was clean and it still doesn't want to work. I wasn't sure if there was anything else I could do, or if the motor was bad. I'm thinking maybe the impeller still, but I can't seem to get it clean enough or somethings is in the chamber. Any ideas?