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A running toilet that stops itself
Toilet not always flushing fully, what could be wrong?Huge Bubble When Toilet Flushes, Why?Toilet Still GurglingToilet Tank slow leak, have all new parts, tried all troubleshooting…help!Why is my toilet not flushing completely?Toilet leaking above couplerLow water level in the bowl of the toilet after flushingFixing a slowly leaking toilet tankToilet fill value hissing and dripping after it reaches the stopping level.Toilet weak flush. The water in the bowl swirls, but it didn't flush stuff into the pipe
I have a toilet that will start running as if the flapper is bad. (I’m confident it is not. I’ve replaced it twice.) It doesn’t drain much, just enough to trigger a fill every 20 - 30 minutes.
The strange thing is the tank only drains slightly and then stops. If I turn the water off it will only drain approximately 1/4 to 3/8’s of an inch and then stop draining completely. I can leave the water turned off for two weeks and it will never go below that level. I’m thinking if it were a bad seal it would drain completely after that time.
Is it a crack in the tank? I’ve just about had it and ready to replace the toilet. It’s approximately 20 years old.
toilet
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I have a toilet that will start running as if the flapper is bad. (I’m confident it is not. I’ve replaced it twice.) It doesn’t drain much, just enough to trigger a fill every 20 - 30 minutes.
The strange thing is the tank only drains slightly and then stops. If I turn the water off it will only drain approximately 1/4 to 3/8’s of an inch and then stop draining completely. I can leave the water turned off for two weeks and it will never go below that level. I’m thinking if it were a bad seal it would drain completely after that time.
Is it a crack in the tank? I’ve just about had it and ready to replace the toilet. It’s approximately 20 years old.
toilet
New contributor
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
have a good look at every component at the water level where the draining stops ..... there may be a small hole that allows the water to drain from the tank ...... when the water drops below the hole, then the draining stops
– jsotola
10 hours ago
2
If the fill hose/tube (the hose/tube that runs from the fill valve to the overflow tube) is inserted into, rather than clipped above and aiming into, the overflow pipe, siphon action will lower the water level in the tank down to the distance the fill hose/tube is inserted. Ensure the fill hose/tube is not inside of the overflow pipe below the normal water level.
– Jimmy Fix-it
8 hours ago
add a comment |
I have a toilet that will start running as if the flapper is bad. (I’m confident it is not. I’ve replaced it twice.) It doesn’t drain much, just enough to trigger a fill every 20 - 30 minutes.
The strange thing is the tank only drains slightly and then stops. If I turn the water off it will only drain approximately 1/4 to 3/8’s of an inch and then stop draining completely. I can leave the water turned off for two weeks and it will never go below that level. I’m thinking if it were a bad seal it would drain completely after that time.
Is it a crack in the tank? I’ve just about had it and ready to replace the toilet. It’s approximately 20 years old.
toilet
New contributor
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a toilet that will start running as if the flapper is bad. (I’m confident it is not. I’ve replaced it twice.) It doesn’t drain much, just enough to trigger a fill every 20 - 30 minutes.
The strange thing is the tank only drains slightly and then stops. If I turn the water off it will only drain approximately 1/4 to 3/8’s of an inch and then stop draining completely. I can leave the water turned off for two weeks and it will never go below that level. I’m thinking if it were a bad seal it would drain completely after that time.
Is it a crack in the tank? I’ve just about had it and ready to replace the toilet. It’s approximately 20 years old.
toilet
toilet
New contributor
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 10 hours ago
razorpitrazorpit
111
111
New contributor
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
razorpit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
have a good look at every component at the water level where the draining stops ..... there may be a small hole that allows the water to drain from the tank ...... when the water drops below the hole, then the draining stops
– jsotola
10 hours ago
2
If the fill hose/tube (the hose/tube that runs from the fill valve to the overflow tube) is inserted into, rather than clipped above and aiming into, the overflow pipe, siphon action will lower the water level in the tank down to the distance the fill hose/tube is inserted. Ensure the fill hose/tube is not inside of the overflow pipe below the normal water level.
– Jimmy Fix-it
8 hours ago
add a comment |
2
have a good look at every component at the water level where the draining stops ..... there may be a small hole that allows the water to drain from the tank ...... when the water drops below the hole, then the draining stops
– jsotola
10 hours ago
2
If the fill hose/tube (the hose/tube that runs from the fill valve to the overflow tube) is inserted into, rather than clipped above and aiming into, the overflow pipe, siphon action will lower the water level in the tank down to the distance the fill hose/tube is inserted. Ensure the fill hose/tube is not inside of the overflow pipe below the normal water level.
– Jimmy Fix-it
8 hours ago
2
2
have a good look at every component at the water level where the draining stops ..... there may be a small hole that allows the water to drain from the tank ...... when the water drops below the hole, then the draining stops
– jsotola
10 hours ago
have a good look at every component at the water level where the draining stops ..... there may be a small hole that allows the water to drain from the tank ...... when the water drops below the hole, then the draining stops
– jsotola
10 hours ago
2
2
If the fill hose/tube (the hose/tube that runs from the fill valve to the overflow tube) is inserted into, rather than clipped above and aiming into, the overflow pipe, siphon action will lower the water level in the tank down to the distance the fill hose/tube is inserted. Ensure the fill hose/tube is not inside of the overflow pipe below the normal water level.
– Jimmy Fix-it
8 hours ago
If the fill hose/tube (the hose/tube that runs from the fill valve to the overflow tube) is inserted into, rather than clipped above and aiming into, the overflow pipe, siphon action will lower the water level in the tank down to the distance the fill hose/tube is inserted. Ensure the fill hose/tube is not inside of the overflow pipe below the normal water level.
– Jimmy Fix-it
8 hours ago
add a comment |
3 Answers
3
active
oldest
votes
Maybe there is a small crack or leak near the top of the toilet tank overflow tube. See diagram below at red arrow.

(Picture Source: https://titanzplumbing.com/does-your-toilet-randomly-start-running/)
add a comment |
Clearly the flapper - and just as importantly, the bottom of the tank where the flapper sits - is just fine. Otherwise you would have the toilet eventually empty when the incoming water is turned off.
You have some sort of problem with the fill valve and/or the overflow pipe. This (a) deliberately feeds some water normally into the toilet after the flapper has closed and (b) if the fill valve were to fail open (not a good thing as it would waste a lot of water very quickly), it would let the water drain down the sewer instead of overlowing the tank onto your bathroom flower.
A 20 year old toilet is old enough that the fill valve and other parts can start to fail. But new enough that standard replacements should work just fine (as opposed to 40 year-old 3.5 gallon toilets). There are plenty of choices (Fluidmaster, Danco, etc.) and the whole kit runs typically $10 to $25 - a lot less than a new toilet. I would avoid the old ball float styles - even if your existing toilet uses one there is no reason to stick with that - the new types are, in my opinion, much better.
I read "bathroom flower", can you changes that part to "bathroom floor" (change too small to suggest edit)
– Ferrybig
1 min ago
add a comment |
You probably have a crack in the overflow, the little tube that terminates just above the water line.
You may have to deform it a little by squeezing it for it to become apparent.
add a comment |
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3 Answers
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3 Answers
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Maybe there is a small crack or leak near the top of the toilet tank overflow tube. See diagram below at red arrow.

(Picture Source: https://titanzplumbing.com/does-your-toilet-randomly-start-running/)
add a comment |
Maybe there is a small crack or leak near the top of the toilet tank overflow tube. See diagram below at red arrow.

(Picture Source: https://titanzplumbing.com/does-your-toilet-randomly-start-running/)
add a comment |
Maybe there is a small crack or leak near the top of the toilet tank overflow tube. See diagram below at red arrow.

(Picture Source: https://titanzplumbing.com/does-your-toilet-randomly-start-running/)
Maybe there is a small crack or leak near the top of the toilet tank overflow tube. See diagram below at red arrow.

(Picture Source: https://titanzplumbing.com/does-your-toilet-randomly-start-running/)
answered 10 hours ago
Michael Karas♦Michael Karas
44.5k53484
44.5k53484
add a comment |
add a comment |
Clearly the flapper - and just as importantly, the bottom of the tank where the flapper sits - is just fine. Otherwise you would have the toilet eventually empty when the incoming water is turned off.
You have some sort of problem with the fill valve and/or the overflow pipe. This (a) deliberately feeds some water normally into the toilet after the flapper has closed and (b) if the fill valve were to fail open (not a good thing as it would waste a lot of water very quickly), it would let the water drain down the sewer instead of overlowing the tank onto your bathroom flower.
A 20 year old toilet is old enough that the fill valve and other parts can start to fail. But new enough that standard replacements should work just fine (as opposed to 40 year-old 3.5 gallon toilets). There are plenty of choices (Fluidmaster, Danco, etc.) and the whole kit runs typically $10 to $25 - a lot less than a new toilet. I would avoid the old ball float styles - even if your existing toilet uses one there is no reason to stick with that - the new types are, in my opinion, much better.
I read "bathroom flower", can you changes that part to "bathroom floor" (change too small to suggest edit)
– Ferrybig
1 min ago
add a comment |
Clearly the flapper - and just as importantly, the bottom of the tank where the flapper sits - is just fine. Otherwise you would have the toilet eventually empty when the incoming water is turned off.
You have some sort of problem with the fill valve and/or the overflow pipe. This (a) deliberately feeds some water normally into the toilet after the flapper has closed and (b) if the fill valve were to fail open (not a good thing as it would waste a lot of water very quickly), it would let the water drain down the sewer instead of overlowing the tank onto your bathroom flower.
A 20 year old toilet is old enough that the fill valve and other parts can start to fail. But new enough that standard replacements should work just fine (as opposed to 40 year-old 3.5 gallon toilets). There are plenty of choices (Fluidmaster, Danco, etc.) and the whole kit runs typically $10 to $25 - a lot less than a new toilet. I would avoid the old ball float styles - even if your existing toilet uses one there is no reason to stick with that - the new types are, in my opinion, much better.
I read "bathroom flower", can you changes that part to "bathroom floor" (change too small to suggest edit)
– Ferrybig
1 min ago
add a comment |
Clearly the flapper - and just as importantly, the bottom of the tank where the flapper sits - is just fine. Otherwise you would have the toilet eventually empty when the incoming water is turned off.
You have some sort of problem with the fill valve and/or the overflow pipe. This (a) deliberately feeds some water normally into the toilet after the flapper has closed and (b) if the fill valve were to fail open (not a good thing as it would waste a lot of water very quickly), it would let the water drain down the sewer instead of overlowing the tank onto your bathroom flower.
A 20 year old toilet is old enough that the fill valve and other parts can start to fail. But new enough that standard replacements should work just fine (as opposed to 40 year-old 3.5 gallon toilets). There are plenty of choices (Fluidmaster, Danco, etc.) and the whole kit runs typically $10 to $25 - a lot less than a new toilet. I would avoid the old ball float styles - even if your existing toilet uses one there is no reason to stick with that - the new types are, in my opinion, much better.
Clearly the flapper - and just as importantly, the bottom of the tank where the flapper sits - is just fine. Otherwise you would have the toilet eventually empty when the incoming water is turned off.
You have some sort of problem with the fill valve and/or the overflow pipe. This (a) deliberately feeds some water normally into the toilet after the flapper has closed and (b) if the fill valve were to fail open (not a good thing as it would waste a lot of water very quickly), it would let the water drain down the sewer instead of overlowing the tank onto your bathroom flower.
A 20 year old toilet is old enough that the fill valve and other parts can start to fail. But new enough that standard replacements should work just fine (as opposed to 40 year-old 3.5 gallon toilets). There are plenty of choices (Fluidmaster, Danco, etc.) and the whole kit runs typically $10 to $25 - a lot less than a new toilet. I would avoid the old ball float styles - even if your existing toilet uses one there is no reason to stick with that - the new types are, in my opinion, much better.
answered 10 hours ago
manassehkatzmanassehkatz
9,2721335
9,2721335
I read "bathroom flower", can you changes that part to "bathroom floor" (change too small to suggest edit)
– Ferrybig
1 min ago
add a comment |
I read "bathroom flower", can you changes that part to "bathroom floor" (change too small to suggest edit)
– Ferrybig
1 min ago
I read "bathroom flower", can you changes that part to "bathroom floor" (change too small to suggest edit)
– Ferrybig
1 min ago
I read "bathroom flower", can you changes that part to "bathroom floor" (change too small to suggest edit)
– Ferrybig
1 min ago
add a comment |
You probably have a crack in the overflow, the little tube that terminates just above the water line.
You may have to deform it a little by squeezing it for it to become apparent.
add a comment |
You probably have a crack in the overflow, the little tube that terminates just above the water line.
You may have to deform it a little by squeezing it for it to become apparent.
add a comment |
You probably have a crack in the overflow, the little tube that terminates just above the water line.
You may have to deform it a little by squeezing it for it to become apparent.
You probably have a crack in the overflow, the little tube that terminates just above the water line.
You may have to deform it a little by squeezing it for it to become apparent.
answered 10 hours ago
Joe FalaJoe Fala
2,531120
2,531120
add a comment |
add a comment |
razorpit is a new contributor. Be nice, and check out our Code of Conduct.
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2
have a good look at every component at the water level where the draining stops ..... there may be a small hole that allows the water to drain from the tank ...... when the water drops below the hole, then the draining stops
– jsotola
10 hours ago
2
If the fill hose/tube (the hose/tube that runs from the fill valve to the overflow tube) is inserted into, rather than clipped above and aiming into, the overflow pipe, siphon action will lower the water level in the tank down to the distance the fill hose/tube is inserted. Ensure the fill hose/tube is not inside of the overflow pipe below the normal water level.
– Jimmy Fix-it
8 hours ago