[wrvond]

I seem to have spoken too soon. About a day after calling this one a success, it started back filling the water tank again - worse than before. Wondering what I might have done to cause this I pulled the pump again.
It was then I noticed another piece that I had not pulled apart the first time.
When I opened it up I found a spring loaded plunger with a silicone seal that was not seated properly. Examination revealed it had never properly sealed, either. I thought that flipping the sealing disc over might possibly fix the problem, but no joy (though it did reduce the flow back to a drip). I contacted Pentair using the phone number on the pump and they were most helpful. I've emailed them the requested information and should be getting a new seal in a few days. In the meantime I have ordered a Camco brass check valve that I intend to install on the pressure side of the pump so I'll not have this problem in the future.