Practical tips
- Put a few drops of food coloring in the tank; if color shows in the bowl without flushing, the flapper is leaking.
- Check that the flapper chain is not too tight or tangled so the flapper can seal.
- Adjust the float so water stops below the top of the overflow tube.
- If new parts do not stop the running, or bolts and valves are corroded, call a local plumber.