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there is a gasket beetween the tank and the bowl. the gasket could either be pinched or need to be replaced. It's an easy fix, and you can find standard gaskets at your local hardware store. there should be two or three bolts underneath the bowl. be sure to shut the water off first and flush the toilet as many times as possible to get the water out of the tank. Good luck.

AnswerThere are two possible causes why your toilet tank leaks when flushed.The mostcommon one would be your tank to bowl gasket that sits between your tank & bowl.you would need to replace it.The secound can be tricky.Check in your tank andmake sure your fill tube is in the overflow.This tube fills your bowl when you flush.If it is out it can cause a leak even if your T.top is on.. AnswerYour right on checking the fill tube first, i have seen it before. And I'm surei will see it again. But yes 9 out of 10 will be gasket
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12y ago
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15y ago

Because the float valve is leaking. When the toilet cistern fills with water to the correct level a float puts pressure on a valve usually with a ruber washer of some sort. Either there is not enough pressure put on the washer by the float to stop th flow of water or the washer has become worn or perished. it is easily replaced and parts are usually available at your hardware. Even if you can get the replacement part units are available to replace the whole refiling control.

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15y ago

This is usually caused by a leaking ballvalve in the cistern.

A lot of toilets now have a built in overflow system which allows excess water to go back in the pan via the syphon.

If you want to do a quick check turn off stop tap, open cold water tap on downstairs sink and leave open, go back and check the toilet if water has stopped then its the ball valve. It needs a new washer or ball valve replacement. Turn downstairs sink tap off and switch stop tap back on wipe stop tap with kitchen towel and check for leaks sometimes turning stop tap off can cause it to leak.

If your not sure i would get a qualified plumber to check it out.

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Q: What would cause a toilet's tank to leak a lot whenever flushed?
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