John S Sun Prairie , WI May 05, 2020 Appliance: Whirlpool Undercounter Dishwasher GU1500XTLQ1 Whirlpool Dishwasher Gu1500xtlq1: Sump went out. How to replace Pump And Motor Assembly. Bought a new sump and replaced it. New sump fits, but it is a lot harder to fit in than what it shows in the video. You have to push really hard to get the rubber gasket to seat correctly so you can get the holding brackets in. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes