I have a new well pump, and a ?uncertain age? 60 gallon pressure tank. The well ran dry last spring, and I killed the pump in the process, so they replaced the pump. The pump installer messed up the pressure settings and told me that the tank was toast...well, I didn't have money to replace the tank and so I returned the pressure settings on the pump to normal and its worked.....until this week. I keep finding the pump on when I wake up? it runs for a while and then cuts off, just like normal, but why is it on? Also, the pump seems to be running longer before it cuts off. One side point....the pump guy kept letting air OUT of the pressure tank. Would this matter?