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Ralph Mowery[_3_]

In article ,
says...

I will guess your bladder has a pinhole leak in it. When the water
pressure is at its max, a small amount of water leaks into the air
chamber. It stops leaking when the air chamber gets up to the 60 psi
you have observed. When the water side pressure it lowered, the leak
seals itself. The air side is left at the system max pressure but is
still mostly air. I believe your problem will be solved when your
tank is replaced.

That sounds like what may be the problem. Anyway a new tank should be
instlled Monday.

I worked many years solving problems where I worked on mostly electrical
and instruments but some other systems. I always liked to hae a good
idea of what was causing the problem before I replaced things as it
could run into thousands of dollars.