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AngeloUCF 01-17-2010 12:37 PM

Toilet leaking air sound
There is a toilet that sounds like it is leaking air constantly. It does not appear to affect flushing, but the water level in the bowl does change. The sound appears to come from around the fill valve in the tank, but I can't pinpoint it. Any suggestions before I replace the entire thing? I've never replaced anything aside from the flapper but I'm pretty handy. Also, the air leak will often smell of exhaust fumes, which worries me.

plummen 01-17-2010 05:31 PM

can you be more specific? :)

AngeloUCF 01-17-2010 05:39 PM

Sure, but I don't know what else you need to know :confused1:

It sounds like an air leak coming from the tank and does not stop, it's constant. I don't know where to start looking for issues.

plummen 01-17-2010 06:09 PM

is it spraying water from fill valve that youre hearing? is it a ballcock or a fluidmaster valve?

AngeloUCF 01-17-2010 06:50 PM

It's a fluidmaster 400A. I don't see any water spraying from anywhere. The sound does go away when I push the "float cup" down but of course because the water starts to flow. I'm not sure if I called it correctly, it's the larger cylindrical black piece in the below picture

handy man88 01-17-2010 08:48 PM


Originally Posted by plummen (Post 384672)
is it spraying water from fill valve that youre hearing? is it a ballcock or a fluidmaster valve?

One of my toilets does spray water from the fill valve during fill after a flush.

With the toilet tank lid design, no water has leaked out and the toilet fills and works normally otherwise.


Also, do you have a bias against fluidmaster valves?

plummen 01-17-2010 10:28 PM

i love fluidmasters myself,easy to work on.sometimes you get some crud stuck in the little diaphragm under top cap.
1.shut water off to toilet
2.pry the plastic cap off fluid master,usually just pry out on front corners then pull backon cap till it comes off.
3.the little plastic piece underneath that lever connects to turns counter clockwise to come off,pull up on the little locking taps till they clear then twist.
4.pull the little black rubber out and clean it
6.hold your hand over top of cap when you turn water back on in case tabs didnt catch,ive learned this the hard way! :laughing:

willowgirl 01-18-2010 12:20 AM

Hum, I would try 2 things myself that would be quick and you don't to take anything apart.
You said you just changed the flapper, if it wasn't doing it before, it may not be sitting right to make it seal. which would keep like a slow run and there would be air pulled some. Just either unhook the chain and push the flap down tight. ( I saw a plumber put dish soap once and that fixed the problem, helped it slid into place or something i guess ) (There are different flaps for different toilets. )
Or the pull rod/ or pull rod spring isn't moving up enough to stop the water flow. My toilets are a little different, but if you lift it easily ( if not lift, lower ) you will probably here the water stop. The ones I have a screw on top you adjust it. Or maybe it just a little rusted.

Thurman 01-18-2010 08:36 AM

I'm with "plummen" on this one. Those are reliable units, but one very small piece of grit under the diaphragm will cause a very small leak which may be what you hear. Follow his instructions and I'll bet this will help. Thanks, David

bob22 01-18-2010 06:47 PM

Make sure water level in tank is no higher than the black line on the overflow tube. If so, it will continue to allow water in and that may be the sound you are hearing. To adjust, you adjust the black float with the spring clip so it is lower on the tower.

AngeloUCF 01-18-2010 09:52 PM

Thanks everyone, I'll try that plummen.

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