On Tue, 19 Jul 2011 11:41:19 -0400, wrote:

On Mon, 18 Jul 2011 01:33:15 -0400, Tony Sivori
wrote:

Joerg wrote:

Tony Sivori wrote:

WTF!? Wouldn't a leaky seal leak whether the tank fills very slowly or
at a normal pace? Why would that make a difference?


That points to the fill valve. What kind is it?

A Flushmaster, installed about one year ago.

I sometimes had that happen that on 40 year old Kohlers. Slow leaks,
drip .. drip .. drippity-drip .. drip ... No leaking when shut-off
almost closed but leaks when fully open. It was the little hose that
goes into the overflow pipe.

I think if the fill valve were leaking, the water would overfill the tank.
No. There is an overflow that causes the excess water to go into the
bowl before it would overflow the tank. That could be what is
happening in your case. Make it happen on purpose (by holding the
float up) while you are watching and you will see what I mean.

That's probably the cause. If the valve doesn't close fully water
will overflow into the overflow pipe and into the bowl.
You can see that easy enough.
But the main water outlet is at the bottom of the tank.
The tube going into the overflow pipe isn't under any head pressure
so a minor leak in the valve the water will flow there first.
That's assuming there's only one actual valve for both main outlet and
tube, which is probable. Never took one apart so that's a guess.
An easy way to prove it is to pull the tube from the overflow pipe and
see if there's water coming from it when the valve is supposed to be
closed.
I think Tony said it doesn't always do it, so there might be some grit
in the valve. Tapping the valve with a screwdriver handle while open
may clear it out.

--Vic