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Thread: Deep well pump kicks in at 35 PSI and drops to "0" PSI - what's going on?

  1. #1
    DIY Junior Member Roadhog's Avatar
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    Apr 2011
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    Ottawa Lake, MI
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    Default Deep well pump kicks in at 35 PSI and drops to "0" PSI - what's going on?

    I had a new deep well pump and bladder tank just installed. The pressure switch is set between 35 - 50 PSI and seems to work fine - the problem occurs when the pressure drops to 35 PSI, the pump kicks on, but the pressure drops to zero instantly for a second or two before the pump can build up pressure. It almost seems like a check valve is missing or something.
    I'd like to get a little knowledge of the situation before calling the plumber who installed it.

    Thanks

  2. #2
    DIYer, not in the trades LLigetfa's Avatar
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    Feb 2011
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    NW Ontario, Canada
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    Default

    The precharge on the bladder tank is too high. Calibrate your air pressure gauge with your water pressure gauge.

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