Cycles every 5 min when faucets are turned off to keep up pressure. Checked all fittings starting at the pump to faucets ect. All are tight. I have screen on pump and that is clean. Rebuild or just ...
IF there are no leaks it may be the check valve in the pump. Pumps have a check valve that holds pressure after the pump shuts off and it may be leaking back into the fresh water tank. You can rebuild the pump or install a after market check valve in the water line downstream of the pump.