Where is the leak?

bill57rJuly 29, 2010

Water had very slowly be leaking past the flapper in the toilet tank of my American Standard toilet, causing my Fluidmaster float to periodically replace the water in the tank. I replaced the flapper, and water is still leaving the tank very slowly. The rubber flapper seems to be seating OK. So, how is the level in the tank slowly lowering? What should I look for?

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jimbochap

Even though the rubber flapper looks and appears seating properly be sure to use a rag and wipe clean all the scum and foreign matters that the rubber flapper seats on.

    Bookmark   July 29, 2010 at 5:12PM
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justalurker

Did you use a brand name flapper for replacement or an unknown brand?

The coarser back of a dish washing sponge works great for burnishing off the unseen mung on flapper valve seats. A light touch does the trick.

    Bookmark   July 29, 2010 at 5:41PM
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bill57r

The identical replacement at my local hardware store was Ace Hardware brand. It was the only one exactly like my old one.
I tried cleaning the surface where the flapper rests with a cloth. I'll try something coarser.

    Bookmark   July 29, 2010 at 9:16PM
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justalurker

The Fluidmaster reds and the Korkys seem to be very reliable.

    Bookmark   July 29, 2010 at 9:27PM
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bill57r

I cleaned the surface, and I think the water is getting by somewhere else. But where?

    Bookmark   July 30, 2010 at 12:00AM
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justalurker

I have seen instances where a new flapper just didn't seal. Try a new flapper.

Is the water in the tank rising to the level of the overflow tube?

    Bookmark   July 30, 2010 at 12:08AM
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tim45z10

There is a possibility of a hairline crack in the seat you cleaned with the rag.

    Bookmark   July 30, 2010 at 1:27AM
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jakethewonderdog

First guess is the flapper and seal.

I have seen situations where the valve was replaced and the fill tube was too long. Instead of trimming it to length, the previous person just pushed it down the overflow tube. The result is that it slowly siphoned the water from the tank.

Since this is a new valve, check to see if the fill tube is too long.

    Bookmark   July 30, 2010 at 9:07AM
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bill57r

Thank you, all! I returned the flapper that would not seat properly, and replaced it with a Fluidmaster flush valve Repair Kit. Seems to be a way better system. My desire to stay with as close to original as possible, wasted a lot of time and caused a lot of frustration.

    Bookmark   July 30, 2010 at 6:00PM
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justalurker

Usually the most obvious solution is the correct one.

It'a hard to beat the Fluidmaster stuff for price and reliability.

    Bookmark   July 30, 2010 at 6:28PM
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