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Thread: Pump wont prime

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    Pump wont prime

    I noticed my pump making the wrong sound (tone seems to vary rather than a confident purr) and would not self prime. After leaving it running for 5 minutes, I turned it off. I dissembled the valve in front of the pump and with a garden hose filled the skimmer pipe with water. Re assemble valve and pump now primes and away we go. If I turn the pump off and leave it for 15 minutes, wrong noise and wont prime. I think I may have a cracked pipe or faulty seal at one of the elbow joins under ground. Apart from calling in a leak detector guy is there anything else I can do to try and fault find the problem ?

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    Mod Squad JohnT's Avatar
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    Re: Pump wont prime

    Check and lube your O-rings on the strainer lid and the drain plug on the basket.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Pump wont prime

    I checked the o-ring and there is plenty of grease and no gunk stuck on it. Gave it a clean with a jet of water just in case. the pump dose not have a drain plug.

    I noticed in reading the manual for the pump you should have a check valve installed if the pump is more than 500 mm above the water level. My pump is 1000 mm above water level and I have no check valve. Where dose the check valve go ? directly in front of the pump ?

    I found this useful doc from Jandy on pool plumbing setup http://instantpoolparts.com/manualfiles ... matics.pdf
    my plumbing is like page 3 with no check valves, one skimmer, no heater and no pool drain.

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    Re: Pump wont prime

    So, after the pump is primed and circulating water and then you shut off the pump, the water in the pump strainer basket must start to lower almost immediately....correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pump wont prime

    Yes, that's correct. the water that is visible through the clear lid on the strainer drops quickly. Given the pump is 1000 mm above the level of the pool, gravity would start to act on any water in the skimmer/verticle pipes and the water would drain away to the lowest level (which would be the skimmer pipe underground )

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    Re: Pump wont prime

    Given the pump is 1000 mm above the level of the pool, gravity would start to act on any water in the skimmer/verticle pipes and the water would drain away to the lowest level
    Not if your system is air-tight as it should be. The water cannot escape back down to the pool unless it is being replaced by air from the atmosphere.

    Find where that air is leaking into the system (you should be able to hear it with the pump off) and your issue will be solved.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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