Fill Valve

[William Howe]

My toilet was making a constant hissing sound, so I replaced the fill valve with a FluidMaster fill valve. The toilet is working perfectly fine, but now every five or so minutes there is a semi-flush, where its making the noise of a flush, but weaker. Did I put the water level too high making the bowl overfill? Let me know what I can do to fix this.

 

[havasu]

Change your flapper?

 

[William Howe]

I have a Mansfield toilet that doesn't have the standard flapper and chain setup. Ive been looking into it and think it might be the seal ring that needs replacing. Thoughts?

 

[William Howe]

I actually just watched it happen and its not the flush valve that's making the noise, its coming from the fill valve. There are a bunch of air bubbles on the fill valve stem and the noise is coming from the fill valve itself. Did I do something wrong with my installation? In the picture you can see the air bubbles on the stem as well as my installation. Let me know what im doing wrong.

 

[Twowaxhack]

The toilets ballcock (the fluidmaster) is siphoning the tank and its flowing out of the tube I have circled.

It’s because there’s no air gap to break the siphon.

I circled the problem in red.

 

[Twowaxhack]

Pull the hose out and when you do......listen very carefully and you’ll hear the siphon break.

Once you understand the problem we will continue and I’ll tell you how to correct it.

There are two ways to correct this......

 

[William Howe]

I did what you said and I see what you mean. How would you recommend fixing this?

 

[Twowaxhack]

You could get an old style ballcock and not use the fluidmaster.


Or you could unscrew the top cap on the flushvalve. Then remove the tower that slides up and down.

Use a 1/8” drill bit to make a hole 1” down on the flushvalve that’s still left in the tank from where the cap screws on. The hole will be above the water level in the tank when full of water.

It’s ok to drill the hole at an angle because your drill doesn’t fit inside the tank.

This will allow air to break the siphon.

The hole you drill will be just below this cap that screws on. The hole is drilled in the part that’s still installed in the tank,not the tower that slides up and down.

 

[TomFOhio]

If the toilet is coming on every so often it sounds to me like the red gasket under the flush valve needs replaced.

 

[Twowaxhack]

If the toilet is coming on every so often it sounds to me like the red gasket under the flush valve needs replaced.

That could also contribute to the problem but for a fact of you put a fluidmaster in a Mansfield the way the OP has it, it’ll siphon.

That’s why fluidmaster gives you the hose clip to hold the hose above the water line. Cant use the clip with Mansfield’s design.