jmgratz
Original Owners Club Member
If you think your tank is empty when you have completely drained it and no more comes out and the sensor reads empty....well try this sometime. After you have left the campground and are out in the middle of nowhere pull off and stop, tank off the sewer drain cap and then open gray 1 that drive off with it open. Then try it with gray 2. DO NOT try it with the black tank. You will be amazed how much comes out of they "empty" tank. Once you have tried it circle back here and post what you find. I can tell you mine has never completely emptied when I drain it at the campsite.