We recently bought a house which has city water, but also has a well for outside use. It had apparently frozen at some point before we purchased the house. I replaced all the supply lines and valves, then I discovered the tank had a big hole in it so I replaced it with the same type, pre-charged. Now when I turn it on it will run for a few minutes then shut off, when it shuts off there is no water flow at all until it comes back on. It shuts off then comes back on every few minutes. What is wrong now???????