4/20/2013 6:04 PM
Either the bladder in the tank is bad or it needs air, or if no bladder, it might still need air. I still have pressure tanks on two of my wells and we add air to at least one every week. Without it, the pumps cycle on/off.
You could also put in a cycle stop relay that will prevent the pump from kicking on for a set time, allowing the pressure to drop enough so that when it comes back on, it's running for a longer time to build back pressure.