What no to do, Wash Bay Sump Pump A customer called saying that his wash bay sump pump was not working. It was a 1 horse power centrifugal pump. When we pulled the pump we found the impeller jammed with all sorts of debris as shown in the photo. Whoever swept the floor just swept everything into the sump. The pump was burned out and had to be replaced. What an expensive way to sweep the shop floor.