Pump holds prime but pressure drops to zero when starting

Discussion in 'Irrigation / Sprinkler Forum' started by kegobeer, Jun 22, 2011.

  1. kegobeer

    kegobeer New Member

    Messages:
    2
    Location:
    Panama City Beach, FL
    I had a leaky check valve that caused my pump to cycle rapidly. Once I replaced it, a new problem started. After I primed the pump, it shut off and held pressure at 60psi. I opened a valve, and the pump kicked in around 40psi (I have a 40-60 switch), but almost immediately after that the pressure dropped to zero. I can reprime the pump, and sometimes when the pressure drops it can recover and then run through all the zones perfectly (no pressure drops when it goes from zone to zone), but most often the pump can't recover and I have to shut it off and reprime.

    I hope someone can help me track down this problem. Thanks in advance!
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,826
    Location:
    NW Ontario, Canada
    Busted bladder, too much precharge, or waterlogged tank.
    Last edited: Jun 23, 2011
  3. kegobeer

    kegobeer New Member

    Messages:
    2
    Location:
    Panama City Beach, FL
    Turns out my brand new check valve was bad. The reason the pressure was dropping to zero was because the valve wouldn't open when the pump turned on. Replaced it with another new one and I no longer have a pressure drop when the pump turns on.
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