Sporadic Toilet Tank Filling Home › Forums › Public Forums › General Plumbing › Sporadic Toilet Tank Filling This topic has 1 reply, 2 voices, and was last updated 19 years, 6 months ago by Dwpecksr. Viewing 1 reply thread Author Posts 22 Nov 2002 at 10:20 pm #276016 MasterPlumbersKeymaster If the downstairs toilet hasn’t been flushed in a while and a faucet is opened somewhere in the house, water is let into the toilet tank for a few seconds. There is no evidence of leakage into the bowl.What gives? Gremlins? 23 Nov 2002 at 12:14 am #293287 DwpecksrParticipant you just may have a defective ballcock or you may have a bad flapper that is seeping. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In