On Feb 5, 6:01 am, "buffalobill" wrote:
On Feb 5, 1:12 am, wrote:

I have a problem with my traditional toilet in the basement bathroom.
Occasionally the tank won't refill with water after the toilet is
flushed, however, if I turn on the water in the bathtub beside it the
tank will refill after a few seconds. What causes this problem?
Thanks.

Al

i would replace the old fill valve.
see:www.fluidmaster.com

Agree: Maybe when bathtub water is run the water pressure is reduced
and allows some grit in the toilet valve to ease out of the way and
the water to fill the cistern. Take out and clean (if accessible) and
or replace the toilet fill valve.
PS. Also maybe the toilet fill valve is old, worn and jams.