American Standard 4061 toilet. Can periodically hear the toilet refilling when not in use. No visible issues. Replaced the flapper. Leak remains. No visible cracks on drain tube or tank.

Check the chain the goes between the handle and the flapper.
It should not be taught. If it is it will not permit the flapper to seat
properly and water will leak out. Adjust the chain length so the flapper is seated and there is just a little slack in the chain.

Start with the flapper. They tend to dry up especially with water that contains chlorine. Purchase the American Standard flapper if available for that toilet. Works better than generics.

Usually seeping is from under the flapper. Replace flapper with one designed for that model. Avoid generic flappers.

Order flapper assembly directly from American Standard.1-800-442-1902

There are a few likely causes for a toilet to leak and refill. The most common is the flapper not seating properly. Usualy on an American Standard it is a disc. Either way, they are fairly easy to replace. One test I use to see if the leak is comming from the flush assembly is to put a couple drops of food coloring in the tank and wait a few minutes to see if it appears in the bowl. If so, there is a leak in the flush assembly, usualy the flapper. Hope this heps. Please vote to let me know.

probably the flapper valve is not seating correctly over the outlet. you can fix it by reaching in and twisting the valve one way or the other till it seats properly and the leak will stop.

Replace the flappers, and clean around the flapper seat.

Make sure the water level is 1/2 " below the large vertical tube by either bending the float rod down or adjust the skinny silver rod on a Fluidmaster unit.

You have installed the parts improperly. You must have 3/8 of an inch slack in the chain from the flapper to the handle when flapper is closed.

Troy, the flapper otherwise known as the flush valve is easily replaced. They are also very inexpensive. Sometimes they can become distorted due to the clorine in the water and won't operate in the same way they did when it was new. I bet this will fix your issue and save you money as well.

I have the American Standard Champion 4 toilet. Water is leaking from the tank to the bowl causing the toilet to refill. I've replaced the flapper and cleaned the surface the flapper contact. Nothing seems to work.