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Now that the cause to the OPs question has probably been found? Namely and most likely a ruptured or leaking bladder problem.......... maybe an informational question for personal edification? Please.
Since 1960 until around 1979 we used two shallow well systems. In our first house was a Duro (possibly still in use with fourth owner of that property) and the second as below, a MacDonald. One third HP each with venturi-jet adaptable pump plus attached tank.
Recently had to scrap the pressure tank of the second shallow well tank plus pump system. This second one had been unused since water and municipal water and sewer were installed. The unit had been used for some nine years (1970 to 1979) or so before being retired and had now been sitting under the bench for some 30+ years!
The pump was fine; we took it apart and cleaned out a little bit of crud. The impeller was fine; motor and pressure switch OK etc. Reassembled using stainless bolts. Little bit of a repaint; good as new!
But the tank had numerous low pressure leaks, found by hooking it up to the outlet of a vacuum cleaner and using soap solution. But as far as one could see no evidence of a bladder of any kind. In fact wasn't even aware of such a thing until have seen it mentioned on this news group.
So is/are there a simpler (cheaper) models not using a bladder system? Such as the ones we have used?
TIA for any informational comments.