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Nope - the Flapper is Seated Properly That was the first thing I checked and the flapper is seated properly.

My brother replaced all of the tank components with a Fluidmaster Kit 400AK ( Flush Valve with Adjust-A-Flush Flapper, 400A Fill Valve, Sure-Fit® Chrome Tank Lever, 3 Bolts and Gasket). When the tank filled up, I noted that it kept filling then stopping after a few seconds wouldn't stop. When...