My problem, first the house is only two years old, it's a two story house and toilet is on 2d story, never had a problem before, gone on vacation for 2 weeks and found toilet running constantly upon return, bowl empty, and water seeping through ceiling below. The floor around toilet is dry, all the water is coming from plumbing between floors.

Thanks Greg Templeton

Hey Greg,
Was anybody living in the house while you were gone? If I were there I'd pull the toilet and set it up on a couple of saw horses. I would then take a bucket and fill the bowl to find out exactly just where the source of the leak was. Let me know what you find. Good luck, Tom