Look at the overflow tube to determine which toilet valve is causing the trouble. If water is overflowing into the tube, there’s a problem with the toilet fill valve. If the water level is below ...

To remove the old flapper, just unclip it from the flush rod chain and overflow tube. To replace it, use the same steps. 5. Replace everything except the toilet.

The height of the float should be enough that the tank flushes the bowl with water when you flush the toilet, but not so high that it allows water to run down the overflow tube.

The fill tube connects to the overflow tube inside the tank. Any problems with the fill tube can keep the water from filling the tank after the toilet is flushed.

If the above fixes don’t work, you may need to replace your toilet’s fill valve, typically located to the left of the overflow tube. It can become dirty or brittle over time, and may need ...

Flush the toilet and make sure all the water from the fill tube is going into the overflow tube. That should solve any problems stemming from this piece of wondrous toilet technology.

There are three likely culprits that can cause a toilet to run continuously — the float, flapper, or fill valve. Luckily, each is easy to replace.