Thinking about your issue last night. Before I started taking the pump apart or replacing it. I would pump some water through it from the tank.
It might be a sticky or dirty valve. I had the street hose check valve leak on one of my campers at the start of the year. I was flushing out the tank and water system using the pump. Water started spraying out the hose connection. I stoped the pump and connected the hose and ran water a few minutes. Keep the camper 3 plus more years and never had the issue again.
It might fix the pump check valve by Just pumping water through it?
__________________
Art & Joyce
Current camper: Motor Home
Previous: 2009, 3023-QB and 2003 2720
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