If this happens regularly, it’s a sign that your chain might be the wrong length. Open the tank and check how long the chain is running from the flapper to the handle. {“smallUrl”:“https://www. wikihow. com/images/thumb/8/86/Fix-a-Running-Toilet-Step-1Bullet1-Version-3. jpg/v4-460px-Fix-a-Running-Toilet-Step-1Bullet1-Version-3. jpg”,“bigUrl”:"/images/thumb/8/86/Fix-a-Running-Toilet-Step-1Bullet1-Version-3. jpg/v4-728px-Fix-a-Running-Toilet-Step-1Bullet1-Version-3. jpg",“smallWidth”:460,“smallHeight”:345,“bigWidth”:728,“bigHeight”:546,“licensing”:"<div class="mw-parser-output">\u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U. S. and international copyright laws. This image is not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website....