In article ,
"JoeSpareBedroom" wrote:

Or maybe not a leak, per se. My first floor toilet began running constantly
between flushes 3 days ago. Not full blast, just a trickle to remind me of
how I'll be spending part of my Saturday. Or so I thought. Just noticed a
small puddle in the cellar below the toilet. It's the sewage pipe that's
wet, but the puddle smells clean. My first thought was that the supply pipe
got so cold from running constantly that what I was seeing was condensation,
but as far as I can see (because part of the supply pipe's hidden), that's
not the case.

Next thought: The cold water contracted part of the sewage pipe assembly
enough to leak. But again, based on the lack of smell, that's not it.

Nightmare thought: Wax ring. I don't want to think about that.

There's little or no condensation on the tank itself, and the floor in the
bathroom is dry. Luckily, it's not humid here today.

Hmmm... reminds me of a similar issue a friend had.

Before he bought his house, someone had installed a new overflow tube in
one of his toilets that was a little to long.

All was fine, till later when a little chunk of spooge got caught in his
fill valve causing it not to fully shut off.

The tank water level rose to the top of the overflow tube, but as it was
too high, some also seeped through the tank flush handle hole... it came
out so smoothly it wasn't visibly noticeable running down the front of
the tank.

He finally discovered the source when he happened to touch the front of
the tank and noticed it was wet.

Good Luck!

Erik