Toilet Makes Hissing Sound

Is the water level in the tank overflowing? Or is the tank refilling without anyone flushing it?

later,

tom @

No really overflowing. I have noticed that there is more water in the tank than there should be (water level is above the hard water stains).

I don't think the tank is refilling itself. I did the dye test a few weeks ago and after 20 minutes had a very tiny bit of dyed water in the bowl.

John

So your saying when the toiled is filling it now makes a new noise? This is likely not a problem with the toilet but with the valve/hose to the toilet. Probably the pressure in the pipes has changed and now it hisses. I reinstalled guts in most of my toilets since they all failed (3 years old, F*CK Gerber). But the hose to the toilet was plastic and I think when I reinstalled them, I did not have them straight enough. So water passing through them would make a LOUD sound while the toilet filled. Took a while to figure that one out.

Also on the master bath toilet there was some debris inside the shutoff valve. No idea how that got there.

Its more of a pressure problem and likely the hissing is not from inside the tank but at the shutoff valve. Make sure the hose is not crimped.

IMHO:

Maybe the tank is draining, per your test, and the fill valve is now throttled to maintain the level. Meaning a little is leaking by the flapper, and then some water is being entered into the tank and that is making the sound.

Since I don't like wasting resources, since it usually comes as wasting money for me, I would check the flapper. It could just need a wiping down with a clean rag. If not have someone who knows what they are doing to help diagnose/fix the problem.

Just a guess...

tom @

A good question could be, after the stop valve is closed, does the hissing sound decrease with time, and then disapears?

Just an observation....

tom @