Air leaked out of tank: bad fill valve. OR Leak in bladder: water filled the
air half of the tank behind the bladder.

"Eric Scantlebury" wrote in message
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"Don Young" wrote in message
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You already have the most likely cause: #4 - waterlogged tank.

But the tank has a bladder. How do I determain if it is "waterlogged"
which should be impossible under normal circumstances?

Eric