Hi,
My toilet is giving me some trouble… It fills up when we flush it but then over a short period of time, 90% if the water will drain out. We think it is probably a leaking pipe… but could there be some other explanation?
If you are speaking of the water in the toilet bowl and not the tank, then it is possible that you have a plugged vent pipe.
If it were leaking out of the bowl due to a cracked toilet, you would then have a wet floor or wet ceiling below.
Dodgeman