Richard K Grover Beach , CA March 24, 2017 Appliance: Whirlpool Washer WFW8400TW00 Whirlpool Washer Wfw8400tw00: Water pump was bad wouldn't drain. How to replace Water Pump. Ordered a new pump from appliancepartspros.com. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes