Joy,
Gerald Shippen here....my unit does not seem to automatically fill the bowl
and shut off, can not even see any type of mechanism to provide that
service. I removed the whole unit and replaced the rubber on top of the
flapper which took several weeks to seat and stop leaking H2O into the tank.
It's not a problem to use however it has nagged my "restoration mind-set."
At any rate perhaps someone else on the list can elaborate? Thanks, Gerald