Check the fill valve first, but yes, if the check valve in the pump fails, water will back-flow into the tank when on city water.
You can test for this problem by disconnecting from the city supply and switching t the pump. If the pump brings the system up to pressure and shuts off, then comes back on again without anybody opening a faucet, you probably have a leaking check valve in the pump head. You can rebuild the head or replace the pump.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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