I just moved into an old house built in the 60's. we have a deepwell system with a 40 gallon galvanized pressure tank. The problem used to be that the pump never shut off and now it starts for about 30 seconds then quits and we have no water pressure at all. I do not know what brand of pressure tank or pump motor we have. The pressure builds up to 40 psi on its own while the pump is running, but as soon as the pump shuts off we have water for about 60 seconds and then nothing till the pump comes on again. HELP!!!! I need to know if I should be looking at the pressure tank, the pump, or both to solve this problem.