K4436 toilet bowl won't stop running - Kohler Toilet - One Piece with Ingenium Flushing System - San Raphael by

SOURCE: toilet running and won't stop.....it

When water goes over into overflow tube then that means 2 things.
The rubber flapper at tank bottom is good and does not need replacement at this point.
That leaves 2 possible problems.
1) The flush valve needs to be adjusted so water turns off sooner.
Flush valve lets water into the tank.
For example if you have a float ball on end of brass rod, just bend the brass rod so the float sits lower in the water.
If you have the 'fluidmaster' then a float rides up and down with water level. There is a metal rod with a metal clip. Squeeze the metal clip and move it downward on the metal rod.
2) If water will not turn off after adjusting flush valve, then replace flush valve.
Local hardware store sells the part and can help with instructions.
You need a crescent wrench or large adjustable pliers.
Plumber can also install the flush valve.

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SOURCE: our toilet won't stop running.

the flapper is either stuck open or the fill valve shut off is broken