Willie The Wimp wrote:
Old American Standard toilet from around 1954. Has some Fluidmaster
components in it.

It works OK but about 4 times/day it pumps maybe an additional gallon
of water in, so it has a slow leak.

I checked the stopper and it's apertu both look fine, but I spread
a little vaseline on both to help insure seal. No help. Overflow tube,
etc look OK.

Visual inspection looks OK but it leaks. Any ideas?

Thx,
Willie

Put some dye in it to help you see exactly where it's leaking.

TDD