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 Fluidmaster slow leak/hissing noise - how to repair?
Author: gltgroove

There is a hissing noise but no leak. What can I do? If I push ever so slightly on the device the sound will stop but a little harder push and water begins to drain. Can not stop the slow hiss noise when I release the device. What can I do?

Thank you for your reply.

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 Re: Fluidmaster slow leak/hissing noise - how to repair?
Author: redwood (CT)

If you pick up the float does it stop? If it does the toilet probably has a leaking flapper and the valve is just refilling to keep the proper tank level. If it doesn't stop replace the fluidmaster valve. Also check to make sure that the float is not set too high as it will sometimes bind on the top collar. If this is happening shut off the water at the stop valve near the base of the fill valve there is a ring collar lift the ring and reset the valve 1 notch higher, slide the ring back down to clamp it in place and reset the float height.

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 Re: Fluidmaster slow leak/hissing noise - how to repair?
Author: hj (AZ)

Fludimasters do not adjust by pulling the stem up a notch at a time. They adjust by screwing the top portion in or out of the lower piece. But a constant hissing noise usually indicates a leak at the point where the two pieces join. A new Fluidmaster is the most common repair for it.

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 Re: Fluidmaster slow leak/hissing noise - how to repair?
Author: dlh (TX)

there is a minor adjustment on the float. 99 out of 100 times anything wrong with a fluidmaster can be cured with a simple replacement of the rubber seal just under the cap. as long as it is the fluidmaster with the problem that is

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 Re: Fluidmaster slow leak/hissing noise - how to repair?
Author: gltgroove

What I thought was a hissing sound has indeed turned out to be a leak after I removed the top. The leak appears to be coming from the arm, nipple or refill tube. The spray is slight but enough to be annoying and should be repaired. My Fluidmaster is older than two years and does not have one of those black plastic water level adjustment rods. It has the older metal rod with the locking v-shaped nut used as a slide adjust. This is most likely not the problem as the previous post mentions 99% of the problems are under the top cap.

So do I replace the complete whisper fill valve with the new Fluidmaster W43C or is there something so easy to replace between the top, arm and nipple and refill tube that I'm just not seeing? I do not see a rubber seal under the cap so what can I try?

Thanks for the reply.



Edited 1 times.

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 Re: Fluidmaster slow leak/hissing noise - how to repair?
Author: redwood (CT)

At about $7 a pop for a fluidmaster 400a I would have replaced it a couple of days ago.

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