Toilet leak question...

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Topic by Becky posted 12-12-2014 11:14 PM 11482 views 0 times favorited 8 replies Add to Favorites Watch
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81 posts in 4185 days

12-12-2014 11:14 PM

hey all :)

I wasn’t quite sure where to put this so if I’m in the wrong spot, please feel free to move. I’m trying to troubleshoot a possibly leaky toilet. I’ve replaced all of the innards and it’s still showing water running into the bowl. I’ve shut the water off to see how far the water goes down – the tank empties all of the way and the water in the bowl goes down slightly. the leak does appear to stop however. I was going to try vaseline on the flapper to see if that helps but my dad said I should ask on a home improvement forum and you guys are the go-to :) Plumbing isn’t a forte of mine – more like a weakness. sigh Just not sure where to go from here :) pointers appreciated.

-- aspiring jill of all trades

View joecot's profile


40 posts in 2858 days

05-29-2014 04:06 PM

Have you replaced ALL the innards? The entire flush valve (which requires removing the tank from the bowl)? Have you tightened the bolts that connect the tank to the bowl?

I don’t know the vaseline trick, so I can’t speak to that.

-- Joe Cottonwood -- 99 Jobs: Blood, Sweat, and Houses

View Becky's profile


81 posts in 4185 days

05-29-2014 08:56 PM

yup! got all of it replaced, took the tank off and replaced that part as well. all bolts (even the bolts holding it to the floor) were tightened by dad. apparently the vaseline trick is to put vaseline on the flap to help it seal properly to troubleshoot if it’s the issue.

-- aspiring jill of all trades

View joecot's profile


40 posts in 2858 days

05-31-2014 01:57 PM

Pretty hard to diagnose without seeing it. Sometimes a toilet gets hairline cracks in the porcelain that are nearly invisible—and impossible to repair.

-- Joe Cottonwood -- 99 Jobs: Blood, Sweat, and Houses

View Michael_J's profile


1 post in 2804 days

05-31-2014 02:56 PM

I had this same sort of problem a few years ago when I installed a very good, but used toilet in my basement. I completely rebuilt the toilet and after installing it, the tank was always running water in to the bowl continuously. After many, many attempts to solve the issue, I found the the flush valve mechanism had a defect that was very hard to spot.

View bold1's profile


26 posts in 2931 days

06-08-2014 10:29 PM

One trick you can try is to put food coloring into the tank after it’s full, the leak will pull the coloring to where it’s going out.

View dbray45's profile


157 posts in 2841 days

06-30-2015 12:26 PM

Usually but not always, it is the flapper and flapper seal. If it leaked for a bit (a few days), run your finger nail around the seal that the flapper sits on. What happens is the sealing edge gets a crack or a small erosion groove across the seal edge and at that point, it well never seal. The only remedy is to replace the flapper and seal fitting with new.

-- Love woodworking and fixing most anything

View robinjack's profile


48 posts in 27 days

01-08-2022 09:26 AM

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View DMcK's profile


1 post in 14 days

01-12-2022 07:06 PM

As dbray45 has correctly pointed out, a continuous leak of water into the tiolet bowl STARTS at the flapper valve lip. Replacing the innards from cheap supply houses (Lowe’s, etc) often doesn’t solve the problem as much of their supply is cheaply made offshore / elsewhere. The flapper lip and seat often have very small ridges, tears and cracks in them that cause continued leaking – despite being brand new. Do a thorough check of both the seat and the lip on the flapper valve to ensure this is isn’t the problem.

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