If the problem is at all faucets, as WorkerB suggests, it almost sounds like there is some obstruction in the line prior to the pump that falls back when the pump is turned off and then gets sucked back up when the pump goes active. That's just a pure guess, though. Otherwise, possibly a faulty pump? I assume there is no problem when on city water?
Also, is there a screen on the water pump inlet that might be partially plugged? I don't know if there is or not.
I am really curious about this and would appreciate hearing what you find. Good luck with it.
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