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 ...
Also make sure that there isn't any air in the lines as that can cause it too. If there aren't any leaks, including the toilet, then it is just probably a bad check valve or pressure sensor, either one can be replaced.