I have a sta-rite 1/2hp deep well pump w/20gal pressure tank. Pump and well pipe and foot valve only 4yrs old. I noticed pump started losing pressure and noticed older Pressure tank had leak at base. Replaced pressure tank with new one. Lost prime and reprimed. Pressure switch is 30-50psi and Pressure tank set at 28psi. When pump runs pressure cuts off at 62psi and cuts on at 48psi. I've adjusted the pressure switch at different increments but the cut on pressure stays at 48psi.