I think the pressure tank is bad.it is a Well Saver pressure tank it is factory preset at 38psi.we let all of the air out of it and drained the water lines and then added air back into tank and turned on the pump but when pump kicked off the the pressure in tank read 50 psi.could we have a ruptured bladder?
The correct setting for a bladder tank is 2 PSI under vthe cut in point of the control box. This is set when the pump's shut off and the system's bled down.
Now let's check that bladder tank for a rupturede membrane. There are several ways to test a bladder pressure tank. (1) Open the snifter valve on top of the tank. If water comes out tank's faulty, **OR** (2) Take a metal object and start at the bottom of the tank and start tapping. You should hear a "clunk" until you get about half way up the tank. Then you should hear a "clank".
If you hear the same noise all the way up the tank then it's faulty.
In both cases if it fails (1) and(2) the tank must be replaced. Good luck, Tom