A month ago when dumping the black tank, the gauge went from close to full down to 50 percent, then up to 55 percent and then down to 0 percent about 20 minutes later after I'd closed everything up.
You might try this. If the TT is at home, or close by, go see what the gauge is reading now. If it's not reading empty, then when hooked up, pull in someplace, fill it half full of water, and then drive a ways and dump it. The water sloshing around will take care of it. If you don't know where there's a dump station, use of one of the several apps - and I'm making the assumption they work for Canada?
Some people will tell you to dump ice cubes in there, and they should help, but if you're going to do it, dump two 10# bags in there so there's enough in there so they don't all melt before you get out on the highway.
Bill
