I was trying to dump my tanks after about 900 miles on the road and the pump up and quit on me. I turned it off and could not get it to start again. I waited until I got home the next day to see what I could do about it. I checked all the fuses and they were good so I took a screwdriver and moved the impeller on the pump back and forth until it freed up and would turn continuously in a clockwise direction. That fixed the problem and the pump ran fine on my next attempt to dump. Something was stuck and it just shut the pump off rather than burning it up. Oh, the screw is on the end of the pump facing the street, very easy.