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Thread: Sucking air on on suction side of pump

  1. Back To Top    #1

    Join Date
    Sep 2015
    Plesant Hill, CA

    Sucking air on on suction side of pump

    Hi All,
    I was hoping for some advice before I start replacing stuff. I am getting air on the suction side of my plumbing and I think it's the 3 way Jandy valve that controls flow between skimmer and the drain. When I have it full open it doesn't appear that much air gets pulled into the system. However if I close it in either direction I get more air in the line (especially if I close the skimmer and pull only from the main drain). When pump is off I don't appear to have any leaks, and the water level doesn't appear to drop any more than usual (I don't have an autofill).

    If I'm right what should I look at replacing? The entire valve, or does typically a rebuild + O-rings typically work?

  2. Back To Top    #2
    chiefwej's Avatar
    Join Date
    Jun 2011

    Re: Sucking air on on suction side of pump

    If it is the valve a rebuild should take care of it. When looking for a suction leak, you can often isolate and confirm it with some plastic wrap.
    Tucson, AZ
    19k gallon Pebble Tec play pool/spa, Pentair Intelliflo VS (3 hp) 011018, Super II 2hp (for spa), Aqua Rite T-15 SWG, Pro Grid 60 DE filter, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

  3. Back To Top    #3

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Sucking air on on suction side of pump

    As you pull from either skimmer or main drain, you are applying additional suction (restriction) to the pump intake.

    Check the pump 0 ring first. That varying suction can cause the o ring to leak when suction is high and stop leaking when suction is low (when the jandy is pulling from both sources)
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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