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Where is the leak?

Posted by bill57r (My Page) on
Thu, Jul 29, 10 at 16:31

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?


Follow-Up Postings:

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RE: Where is the leak?

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.


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RE: Where is the leak?

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.


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RE: Where is the leak?

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.


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RE: Where is the leak?

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


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RE: Where is the leak?

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


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RE: Where is the leak?

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?


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RE: Where is the leak?

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


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RE: Where is the leak?

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.


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RE: Where is the leak?

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.


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RE: Where is the leak?

Usually the most obvious solution is the correct one.

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


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