I own A Jayco 3150K 34ft travel trailer. When I hookup the hose from camp water supply/faucet to city water connection on the side of the trailer, after about 15 minutes the bathtub is full of water. Tub doesn't drain until I open the drain for the grey water. Would like some help with this issue.
Water is filling your gray tank and then backing up into your tub. There's another faucet or something open that is filling your gray tank. The bottom of the tub is the low point and after the gray tank fills up, it starts filling your tub.
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