On May 21, 11:47*am, c_shah wrote:
I replace my 20 years old toilet (KOHLER) with a new fill value (made
by MJSIwww.gomjsi.com) and a flapper. It still leaks..at about 4
hours tank is empty looks like it is leaking into bowl (no water
around toilet area)

At this point I am not sure what could be causing it to leak? should I
try another flapper...

If the seat is brass, try smoothing it out with a Brillo pad.
Otherwise you might have to get an OEM flapper. I've had problems with
my 20+ year old Eljer toilet in the past with the flapper. Then I
ordered an OEM Eljer flapper and have no probems since. I ordered from
these guys,
http://www.plumbingpartsdepot.com/
they have all schematics online and very helpful. You might want to
consider getting an OEM fill valve as well.