Turn off the toilet’s water supply by rotating the shutoff valve clockwise until it stops.
Flush the toilet to drain most of the water from the tank and bowl.
Use a sponge and bucket to soak up and remove any remaining water in the tank.
Inspect the rubber flapper at the bottom of the tank for warping, cracks, or buildup.
Remove the old flapper by detaching it from the overflow tube and unhooking the chain.
Install a new flapper by attaching it to the overflow tube and connecting the chain to the flush lever.
Check the chain length to ensure it has a slight slack when the flapper is closed.
Adjust the chain by moving the clip to a different link if it’s too tight or too loose.
Inspect the fill valve for signs of wear, leaks, or improper shutoff after flushing.
If faulty, remove the old fill valve by unscrewing the locknut underneath the tank.
Install a new fill valve according to the manufacturer’s instructions and secure it in place.
Reconnect the water supply line to the fill valve and tighten with an adjustable wrench.
Turn the water supply back on slowly and allow the tank to fill.
Observe the tank as it fills to ensure the flapper seals properly and the fill valve shuts off.
Adjust the float on the fill valve to set the correct water level, usually marked inside the tank.
Flush the toilet several times to confirm the issue is resolved and no water continues running.
Check for leaks around the base of the fill valve and tighten connections if necessary.
Ensure the overflow tube is not allowing water to spill into the bowl continuously.
Clean any mineral buildup from tank components to ensure smooth operation.
Dispose of old parts and clean up tools and any spilled water from the work area.
