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Sounds like the "check-valve" might be the problem. I'm told that on my '73, its right in that vicinity, although I haven't had a chance to check it out myself yet. I was having some leakage out the city water connection when running the pump, too. It was just a dribble; when the pump was activiated, it would pressurize the system and shut off ok; but then it would come on in about 3 minutes, re-pressurize the lines, then shut off.
anyway, seems to make sense that the check valve could be a "weak spot", not preventing back-flow from the pump, and leaking from the city pressure.
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