My wife and I bought an 11-year-old Weinsberg Orbiter, with which we want to start our honeymoon at the beginning of the week. Now an unexpected problem has occurred that makes us perplexed. Maybe someone can give us a hint what could be behind it without having to go to an expensive workshop. Would be very nice. A week ago I emptied the fresh water tank completely and simply for it (which is probably already false). In the bathroom, let the water run into the sink until nothing came. After that, I emptied the waste water tank. The purpose of the action should be that we refill the tank just before our departure into the holiday. Long speech, short meaning: When I refilled 80 liters again and turned up the water in the bathroom, I heard a splash and saw how under the camper water always came out (also a bit after that), how I had run the pump of the sink. I have discovered a kind of overflow (or something that seemed like this to me) from which the water comes out. As we have purchased the mobile without a manual, I find it hard to find out how this Malheur (which did not appear before) can be eliminated. We hope there is nothing “greater” behind it. Does anyone know advice? Thank you very much for anyone who makes the trouble to answer! Greetings, Manni P.S.: The tank is only filled to a quarter after several attempts, nevertheless, water comes out of the “overflow” with every valve use.