Step-by-Step Instructions and Pictures of How to Fix A Running Toilet

By the experts at The Family Handyman
Check inside the toilet tank for a leaky flapper, bad fill valve, or overflow pipe at the wrong height. Read an overview on how to fix a running toilet.
From The Family Handyman
How to Fix A Running Toilet-Step 1
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1. Push down on the flapper with a stick when you hear the water running and listen for it to stop. If it stops, you know the flapper isn’t sealing properly. Replace it. Check the fill tube length and cut it back so it's at least 1/2-in. above the water line.
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