Bob G Sylacauga , AL January 19, 2019 Appliance: Whirlpool Washer WFW9400SB00 Whirlpool Washer Wfw9400sb00: Low water flow and fabric softener would dispense immediately when cycle started. How to replace Water Inlet Valve. Replaced flow meter and control valve 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes