Grey Water Tank Indicator Constantly Reads 2/3 Full

jpi68

We have a 2019 T@B 400. We have hooked our black/grey drain hose up to the dump station at our camp site and first opened the black water valve and drained it completely, shut that valve and then opened the grey water valve and drained it completely,,, However, returning to the cabin and checking the level indicators the grey tank still indicated 2/3 full... I ran the sink water for several minutes and repeated the grey water tank drain procedure... Still indicates 2/3 full.. Camper is level... Does anyone have an idea why 1. Either why our tank won’t drain, or 2, why the tank indicator is stuck on 2/3 full... ???

Denny16

More likely the indicator is stuck.  Mine did this, and as the grey tank refilled, it started reading 1/3 tank.  These indicators are approximate readings at best, and are not very accurate.  They added some Happy Camper to the grey tank to help clean the sensor.
cheers

Sharon_is_SAM

@jpi68 -  put some diluted Calgon down the sink drain and refill the gray tank.  That may help unstick what’s stuck😊

Blueespy

You can drive with some water in both the gray and black.  Add some detergent and/or Happy Camper and move on to your next site.  The sloshing will help clear any waste/paper/etc., from the sensors,