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Thread: Pump loses prime when shuts off

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    Pump loses prime when shuts off

    I have now noticed that when my pump shuts off, it loses prime.
    Note that when running, there are NO bubbles in the return lines into the pool.
    The clear lid is full of water without any bubbles when the pump in running,
    BUT when the pump shuts off, at first everything appears normal but then
    a few bubbles appear under the clear lid and then more until the water drains out
    to a level just below the top of the little basket inside.
    When the pump restarts, it primes itself but obviously not a good situation which
    I'm afraid if not fixes will shorten the life of my pump.
    What can be causing the loss of prime when the pump shuts off ??

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    duraleigh's Avatar
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    Re: Pump loses prime when shuts off

    Welcome to the forum

    More than one thing could cause that but the most likely is a pressure side leak. Pump running, do you see any water puddling around your exposed piping or equipment?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad pooldv's Avatar
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    Re: Pump loses prime when shuts off

    Welcome to TFP!

    More here about tracking down a leak, Pool School - Leak Detection
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Pump loses prime when shuts off

    Quote Originally Posted by duraleigh View Post
    Welcome to the forum

    More than one thing could cause that but the most likely is a pressure side leak. Pump running, do you see any water puddling around your exposed piping or equipment?

    The only water leak is from the multi valve handle but that is much higher than the pump basket.
    I tried pouring water from a watering can over the 4 bolt gasket behind the pump basket (after tightening them a bit to see
    if that helped) as I had seen in another forum but that didn't seem to make any difference, within less than a minute the air
    bubbles started to appear in the clear lid and then more until the water level dropped to just below the basket top.
    I could hear gurgling noises either from the pump itself? or the DE filter.
    Is it possible that a leak from the multi valve is causing the loss of prime at the pump?
    To note the drain bolt on the bottom of the basket has never been removed.
    Any further specifics to track this down would be greatly appreciated. I like a good challenge but so far this has me stumped.

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    mas985's Avatar
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    Re: Pump loses prime when shuts off

    Is it possible that a leak from the multi valve is causing the loss of prime at the pump?
    Yes. It can leak air in when the pump is off.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Mod Squad pooldv's Avatar
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    Re: Pump loses prime when shuts off

    Ha, well, small plumbing leaks are about the most challenging thing of all to track down. Much easier to track down a giant geyser shooting out of some plumbing somewhere. When I had a 20' high stream of water shooting out of my solar panels I didn't have any trouble finding the leak!

    Yes, the leak in the multi valve can let enough air into the plumbing, after the pump is turned off, to lose prime.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Paul-pool's Avatar
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    Re: Pump loses prime when shuts off



    I have the same problem..... My pump seems to have to prime itself as a bunch of the water has gone down in the basket part. As is fairly apparent I am new to all this, any ideas where I could be having problems from? I don't have a multiport valve I'm guessing?

    15000 gallon in ground reinforced concrete gunite, Sta-Rite P2R pump, Sta-Rite PTM70 cartridge filter,Hayward CL110 automatic chlorine feeder, Pentair weir skimmer, using the TGH water testing kit & app
    New pool owner, no experience....need i say more?!!

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