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If your toilet is refilling for no reason and you already replaced the flapper, it may be time to investigate the flush valve. Assuming the fill valve is not malfunctioning, the flush valve may be cracked or damaged, or maybe even the tank has a crack in it.
You will need to shut off the water, flush the toilet to drain the water out of the tank, and remove the tank from the bowl. There are either 2 or 3 tank bolts you will need to remove to lift the tank from the bowl. Once you’ve done this, pour the rest of the water out and set the tank on its back. Remove the nut that holds the flush valve to the tank and pull the valve out of the center of the tank. You may find a crack in the tank here. If you do, it’s probably time for a new tank.
Before you install a new flush valve, compare the height of the new one vs. the old one. You may need to trim the new one to fit. There will be a rubber washer where the flush valve meets the tank bottom to keep water from sneaking past. On the exterior of the tank you will screw a large nut (called a spud nut) onto the threads of the valve. Over the bottom of the threads and nut you will push on a rubber spud washer (or just a “spud”). Reconnect the fill valve hose to the overflow tube.
Set the tank back on the bowl and reinstall the tank bolts snuggly. Reconnect the water supply line and fill the tank. You should not have any water draining from the tank unless you flush the toilet.
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