New well pump pressure surge?

Discussion in 'Irrigation / Sprinkler Forum' started by Rod M1, Aug 20, 2019.

  1. Rod M1

    Rod M1 New Member

    Joined:
    Mar 5, 2005
    Location:
    Michigan
    Hi everyone, I'm having a problem with my new Goulds j10s. It seems to build pressure well if not using any water but shortly after the pump hits cut-on pressure when using the sprinkler it will drop from 30psi to like 20psi with surges to 30psi. I'm using 1 oscillating lawn sprinkler trying to use 2 will drop the pressure to 0. Dues it sound like a bad pump anyway to trouble shoot this?
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Could the well be running short of water?
     
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  4. LLigetfa

    LLigetfa DIYer, not in the trades

    Joined:
    Feb 6, 2011
    Occupation:
    Semi-Retired
    Location:
    NW Ontario, Canada
    Jet pumps use pressure to make more pressure. If you set the cut-in too close to the tank's precharge, the diaphragm in the tank might bottom out before the pump is up to speed. Try setting the cut-in a little higher. If you draw more than the pump/well can produce it can nose-dive.
    You might try cleaning the jet in case it is partially clogged as that will affect the volume and pressure the pump can produce.
     
  5. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    You should have 25-28 PSI air in the tank. When the pressure drops below 28 the bladder in the tank bottoms out and causes the surge. Either the pump is worn and not giving you two sprinklers worth of water or the well is not producing as much as it should.
     
  6. Rod M1

    Rod M1 New Member

    Joined:
    Mar 5, 2005
    Location:
    Michigan
    Thanks guy's I think the well might be the problem. We sprinkled like normal and it did ok today pressure whose more stable but I see gauge is bad.
     
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