If I turn off the breaker, then turn back on, the pump presses the pressure tank up to 60 psi. The switch then turns the pump off. Then the pressure in the tank starts to drop (no water running) to 40. A whistling sound seems to be coming from the tank. The switch turns on the pump, the pump gets the pressure up to 50 but goes no higher so the pump stays on.
replaced the switch and gauge
checked air pressure in tank (38 psi no water spitting out)
checked for leaks in well ( no water at connection where well pipe attaches to horizontal pipe running to house)
found no water leaks in house ( house is 11 years old)
good water pressure, no pulsing.
Also, a few days ago, the pump would press the tank up to 60 psi and the pressure would stay there until we used water. Now it won't stay at 60 so we shut it off when we aren't using water.
A bad check valve would account for the loss of pressure. The lack of ability to build past 50 psi could be a separate issue.
What type of pump do you have? jet pump? deep or shallow setup? submersible? piston pump?