couldn't stop toilet leak

[Banjo Bud]

My toilet was leaking very slowly from the tank to the bowl. It would leak until the float called for water, then fill. This happened about every 4 minutes. I replaced the flapper. No help. I replaced the valve assembly. No help. I replaced the gasket between the bowl and tank. No help. I replaced the stand pipe assembly which included a new flapper. No help. I removed the stand pipe and silicone caulked where it meets the bottom hole in the tank. No help. I pulled the fill hose out and watched it and it was not leaking there. I finally replaced the entire toilet and that did it. I just can't figure out where the toilet was leaking. I thought I covered all the bases. Now that I replaced it, I'm ok but what could have been the problem? Oh, one more perplexing thing. There were two toilets that did the same thing. I replaced them both after I spent $50 in parts on each without fixing the leak.

 

[Reach4]

Good solution, but after you were invested, that was a painful action.

In retrospect, to figure where the leak is, turn off the stop valve at the wall. See where the water level stops dropping. Flapper leaking will stop maybe an inch above the bottom. Hole in overflow could stop higher. And if it stops an inch or less down from max, it was water following the clip with capillary action.

 

[Sponsor]

 

[Banjo Bud]

that's good stuff to know. Thanks.

 

[John Q]

My toilet was leaking very slowly from the tank to the bowl. It would leak until the float called for water, then fill. This happened about every 4 minutes. I replaced the flapper. No help. I replaced the valve assembly. No help. I replaced the gasket between the bowl and tank. No help. I replaced the stand pipe assembly which included a new flapper. No help. I removed the stand pipe and silicone caulked where it meets the bottom hole in the tank. No help. I pulled the fill hose out and watched it and it was not leaking there. I finally replaced the entire toilet and that did it. I just can't figure out where the toilet was leaking. I thought I covered all the bases. Now that I replaced it, I'm ok but what could have been the problem? Oh, one more perplexing thing. There were two toilets that did the same thing. I replaced them both after I spent $50 in parts on each without fixing the leak.

I had the same problem. I found the answer, perhaps somewhere on this forum. It is imperative that the hose that goes to the overfill tube does not go down into the overfill tube, only to the top edge. Regulate the fill valve so that the water in the tank stays at least 1/2" below the top of the tube. I see where others suggest that you add an extension to the overfill tube. By keeping the end of the hose high (above tank water level) you overcome a siphoning action which lowers the water in the tank and sends it to the bowl via the overfill tube. A new fill valve might help as I note on the package from Toto that their new fill valve is anti-siphon design but for me it was a simple fix just ensuring the end of the hose was above tank water level. Hope this helps.