Are you SURE the tank was really full?
Those tank-gauges are notoriously-inaccurate, especially the black-water one. All kinds of .....uuuhhhh... "stuff" .... gets stuck to the sides of the tank and to the sensors during usage and causes them to read inaccurate. There's a lot of different home-remedies and various 'fool-proof' solutions to solving the problem, but I found that just keeping track of usage is just as good.
I also use one of those sprayers that you stick down the toilet and it sprays a jet of water all around inside, seems to do well (for me).
As far as the sink being connected to the black-water tank, I've heard of some rv's being made that way before but don't know if it's true. Easiest way is to open the gray-water tank outlet and run the sink. If water doesn't come out, he was right. Would GS do that? Wouldn't surprise me a bit!
Thanks!
Ron
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