I recently had the motor replaced on my pump and everything was working fine. Two days ago I shut the motor off and switch it to the automatic setting. I noticed today that the pump is running but there is no water running through the filter or lines. Also, there is no pressure. I tried backwashing and I cleaned the skimmer and the pump basket of debris. Could this be a clog in the line? Does it need to be primed (I've never had to prime it before)? Is there anything else I can try?