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Thread: Suction side leak

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    tcat's Avatar
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    May 2012
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    Suction side leak

    I've replaced my pump bowl cover o'ring, cleaned and greased it several times...but still get a small bubble rolling to the top of the cover about every 10 seconds. My cover is old and a little cloudy, so I'm not sure where the bubble is coming from, but it may be from the suction line into the pump. I closed the skimmer and drain valves, and still get the bubble (with pump off). No water leaks with pump running. I'm stumped, what to try?
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    In the Industry
    Qwaxalot's Avatar
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    Re: Auction side leak

    Check the pump drain plug o-rings, replace them if there is any doubt.
    In the industry, CSP (Certified Service Professional) by the NSPI and it's successor the APSP. My company services over 600 pools every year. I think the practices regularly espoused on this forum (especially the BBB method) are outstanding; however my comments will be often oriented towards the goal of getting it done, and getting it done right now!

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    tcat's Avatar
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    Re: Suction side leak

    That seal looks good. If that was leaking I would see bubbles from the drain with the cover off. I'm going to cut me a piece of .25" polycarbonate as a temp cover so I can see what's happening. I really think is coming from the suction side pipe.
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    duraleigh's Avatar
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    Re: Auction side leak

    It's almost never the pipe. How long does that leak take with the pump off before you lose prime?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5
    tcat's Avatar
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    Re: Suction side leak

    Goes down about .25" per hour, so maybe 6-8 hours. Stops below the bottom edge of the output pipe opening. I see the bubble come from the front side of the basket (above pipe output -I think), I can loosen lid and rotate it, and bubble will still come from front. There are no scratches on the bowl top surface. Could it be a pump seal? Maybe the bubble is working its way around from back to front? I would think I would see a water leak if that was the case since that's pressure side.

    With the pump off, I hear a faint "pop", "pop" "pop" (about every 2 or 3 seconds), then one last "pop" and a small bubble appear. This goes on continuously. I loosen the lid, rotate it, tighten it... same results.

    Wouldn't be anything underground would it? I would think I'd see mud.

    Quote Originally Posted by duraleigh
    It's almost never the pipe. How long does that leak take with the pump off before you lose prime?
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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