Your tank may be leaking from the top--but maybe not. Mine also was leaking when full but what was happening was, when it was full there was enough pressure to open a small crack near the bottom. You will never know until you take down the belly skin and look. I took mine down, found the leak and thought I had fixed it. I put the skin back on, not an easy task alone, but the leak returned. I took the skin down again and had a mobil RV repair guy fix it with expoxy. He charged me $20. Three friends and I with a battery screw gun had the skin back on in 45 minutes. So far so good.
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