We had this problem several years ago and discovered it was the check valve built into the pump. At the time, we were not near an RV store, so went into the little town we were near and purchased a check valve that I could install in the PEX line on the pressure side of the pump. It worked like a charm and the pump was just fine except for the failed check valve. I have since replaced the pump for other reasons, but just left the check valve in place. In the photo, the brass check valve is shown above the pump.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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