Toilet tank losing water

Discussion in 'Toilet Forum discussions' started by fernipascual, Jun 9, 2012.

  1. fernipascual

    fernipascual New Member

    Jun 9, 2012

    My toilet tank is losing water causing a constant filling to take place; about every four to five minutes. I changed the flapper thinking that was the problem but it continues doing the same thing.

    Complies with ASME / ANSIA 112.19.2 M

    I don't know what other information to provide.

    Thanks for your help!
  2. Smooky

    Smooky In the Trades

    Apr 4, 2011
    North Carolina
    Last edited by a moderator: Jan 14, 2014
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  4. wjcandee

    wjcandee Wise One

    Apr 27, 2012
    New York, NY
    Do you know the brand of toilet and approximate age? One-piece or two-piece? Alternatively if you can get the model number from the tank or tank lid, that might help, too. These would help us know if it's a 3" or 2" flush valve, for example.

    You had the right instinct to replace the flapper, and it may still be the flapper; you might just need a different one or different style.

    Alternatively, as was suggested above, you might have some leakage around the seat where the flapper seals, and cleaning that area (or installing a new rubber seal around the edge of the seat that meets the flapper -- there is a quick and easy kit for that and it's the easiest of the available fixes) may solve the problem before we get into the kind of toilet surgery mentioned above.

    To see if it's leaking around the flapper still, turn off the tank water while marking with a pencil or eyeballing where the water is. If the tank is lower a few hours later, you have a leak most likely between the flapper and the flush valve. If it's a generic toilet, one of the experts on here recommends the Korky flapper. I have been using the red Korky plus universal flapper with the adjustable cone very successfully, but it also comes without the adjustable feature for a buck or so less. If it's a more unique toilet, but still uses a flapper, look at to see if there is one more suited for your setup, or even call them and ask. They are very, very nice.

    If you have a crack in the flush valve or want to make it take a more standard flapper, you don't need the whole kit with the fill valve as well, you just need the flush valve, and you might consider the Korky universal adjustable one, which I have on two of my toilets. It's relatively-easy to install, but you still need to be at least a little handy, because it involves removing and reinstalling the tank. That's why cleaning and/or putting a new ring seal on the existing flush valve is a step that you should try first after you check whether you are using the right flapper.

    Also, check the tension on the chain between the flush handle and the flapper. There should be minimal slack, but there should be at least a link or two of slack, so the chain isn't holding the flapper off the valve. Believe it or not, there are some toilets (I have one), where the flush mechanism is such that when you put the lid back on, it actually depresses the flush mechanism part way, so you have to leave a few extra links in the chain to compensate. It's unlikely that your toilet does this, but if you have a pushbutton flush, then it might.

    Those are all the thoughts I have without knowing more about the toilet. Good luck!
  5. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    If you shut off the water supply and ALL the water leaks out of the tank, then it is either a bad flapper or a cracked flush valve. If it drains down to a certain point and stops, then you have the small refill tube stuck too far down into the overflow pipe. This is more likely your problem since you have changed the flapper.
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