Quote:
Originally Posted by creativepart
I doubt there is an overflow on top of the tank, but there is a vent pipe that goes to the roof. If the vent pipe is not properly attached to the tank then that could leak but you’d want to have this checked out ASAP.
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One way to do that on a DIY basis would be similar to what they do to check new construction plumbing. Once the system is basically empty, so that everything is clean (assuming you're not where you can dump dirty water), just fill it up until it does have a level inside the shower. Then just let it sit a while and see if the level drops or if you again notice water leaking outside.
Given RV dealers may be scheduling over a month out, that would be easier and faster.
(If you are where you can dump you could just fill the tank the rest of the way when it is near full, and save some water.)