By memas
I had that problem and it was the flapper had a very small raise in it and didn't seal. Once I replaced it, never had it happen again. The water ran through constantly. Now, I keep a spare flapper in the house.
You may want to read these links
http://www.ehow.com/how_117384_stop-toilet-tank.html
http://www.factsfacts.com/MyHomeRepair/ToiletSweats.htm
~Dawn
http://frugalforlife.com
Add your voice to the conversation. Click here to answer this question.