Pump Motor Assembly Replacement pumps ensure proper cleaning and draining of dishes. There are two types of dishwasher pumps: drain pump and water pump. Whereas the dishwasher water pump is in charge of pumping water through the dishwasher during the wash cycle, the dishwasher drain pump is in charge of draining water from the dishwasher. Dishwashing issues, such as standing water in the dishwasher or improperly cleaned dishes, may result from a fault with either pump. If you need to replace a dishwasher pump, be sure to choose the right one