Sorry to hear about the leak, but I feel your pain. My black tank is leaking when it gets FULL. On a return trip from Labor Day (dry camping) I opened my dump cabinet to find it full of...yep, came pouring out at me. I have also noticed dripping around my other exterior cabinets when I fill it full for cleaning or flushing. Tells me the leak is probably somewhere at the top of the tank. The valves are good. Hoping that my vent at the top popped (or pooped
) out as this may be an easy fix. Good luck with your fix.
2001 Itasca Suncruiser, 32v, Ford V-10