I install a new fill valve and flapper and everything is working fine. However when I flush the toilet it makes a strange groaning sound. Help?

Close stop valve underneath toilet tank about one turn, just to see what happens.

Does the sound stops when the tank is filled?

Please see the images below and tell us which fill valve do you have?


John

I install a new Fluidmaster valve, new flapper and a 12" floodsafe stainless steel water supply line with a 3/8" compression and a 7/8 ballcock. The only thing I did not replace was the overflow tube. Everything is working properly except for the groaning noise when I flush.

That leaves on a loose washer in the stop valve. Replace stop valve.

OK do as Hkstroud say, close the angle valve one turn and flush the toilet see if the noise is gone, if it is then it sounds like the loose stem washer inside the angle valve, shut the water to the house remove the packing nut ant stem check the washer for condition if is worn replace it, see the image below, Thanks.

John

I envy the pros on this site, you guys ROCK!
I'm new at this... and I am NOT a plumber, but I recall on a "Ask This Old House" Episode where a homeowner had that problem. The ATOH guy determined it was air in the pipes. Has that been ruled out?
Good Luck,
Pups

My3PupsRule
To answer your question directly and succinctly, there is no such thing as air in a water supply line. The only exception to that statement is if you are on a well and the system is malfunctioning and somehow pumping air. That is extremely rare.

Think about it. Air is lighter than water. Any air trapped in a pipe will rise to the highest point and will be immediately purged from the system when you open a faucet at the highest level. If you open a faucet below the highest level of the piping you will never know that the air is there and it will have no effect.

Hello, I apologize for my incorrect answer to the post. I did, however, say I was NOT a plumber-and that I simply saw an episode on ATOH that addressed such a problem.
Goodness knows, I have multiple mis-understood plumbing problems of my own.
In the future, I promise I won't post any responses unless I am personally familiar with the problem.
Again, I apologize.
Pups

No apology necessary. I was not chastising or correcting, only explaining why you do not have air in a supply line. Perhaps I should have been more diplomatic. Sorry.

Friends?

Absolutely! Thank you for your kindness & consideration:)
I would greatly appreciate it if you'd comment on my post about the rusty water-after a housefire.
With Gratitude
Woof Woof, Pups

Hello My3pupsrule,

Welcome to the plumbing website no apology needed stick around we will learn from each other, there are a lot of experts on this website and we all will learn, Thanks.

John

Stroud - don't worry - your answer was fine, just like you said. Our friend was just a little over-sensitive.

Why is this post up there? The last post was in 2011 is there a question in here?