Even if you replace the flapper, it may not fit correctly, or there may be damage to the rim sealed by the flapper. Try feeling around the rim of the flush valve for divots, cracks or deposits.

You need to replace the fill valve and/or the flapper. The toilet is running because either water is running in the toilet or water is running out. VIEW E-EDITION ...

Q Our toilet has a noise like water running, but it doesn’t flush. It just kind of seeps and my water bill has gone up. Our plumber thought a new flapper valve was needed, so we installed one ...

The flapper valve is designed to hold water in the tank until it is needed to flush the toilet. It has nothing to do with the drain venting system, which is where the odor would seem to originate.