Flush valve closes before toilet flushes completely?

Fill the breather hole (1/8" hole) inside the flapper.This is designed to let air out so the flapper will sink. Now it floats longer letting in more water. 25%percent more in my case.

I had this issue as well with my toilet. My chain was unattached and had been sucked down the drain under the stopper valve preventing the toilet stopper valve from completely closing and causing the water to continually run. After re-attaching the chain I noticed when I flushed the toilet that the handle did not rise again until I manually pushed it up. After readjusting the chain to a tighter position where the chain was not floating at all but instead holding the stopper valve in place I again flushed to check the reaction. This fixed the issue of the water continually running and also the handle not resetting itself properly.

Here is the steps I took to resolve my issue:

Step 1: Remove the lid off of the tank.

Step 2: Check to see if the chain coming from the Toilet Handle to the Stopper Valve is loose, unattached, or broken.

Step 3: Flush the toilet and check to see if the problem has been fixed. If not readjust the chain to a different position and flush again.

Step 4: If all is resolved replace the tank lid.

Other possible things to check:
Check the Float Ball to see if it's Half-way or more submerged in the water. If it is it needs to be replaced.

I hope this helps!

Buy a fluidmaster flush fixer complete kit. about 20.00 or so includes flush valve, flush flapper, tank bolts flush handle. Follow directions

lift off cover and shorten flapper to handle chain/rubber connection flapper not opening all the way

Take off the top lid and look at the flush handle mechanism. You'll see a not that holds it onto the tank. Tighten the nut so it is snug. Don't overtighten it or you could crack the tank. Next inspect the chain that goes between the end of the flush handle rod and the flapper valve. It should lift the flapper all the the way up when you operate the handle.

Not being a plumber by trade I don't want to bad mouth what your plumber had to say but there may be other things to consider.
If the toilet does not flush directly into the main drain there is the possibilty that the coupling between the main drain and the toilet drain is under-sized which could cause reduced water flow and your toilet not flushing completely.

Which style of flush valve do you have? If it is the dual-flush option (solids/liquids) I do not know how to adjust those. If you have a traditional style, then the flapper or ball is closing too soon. You need to adjust the guide arm (flush ball) higher or shorten the chain between the flapper and the handle. Adjust this carefully or you will have it fail to seat and the toilet will constantly run.

I hope this helps.

Cindy Wells
(who needed to replace the fill valve and the flapper at her home earlier this week)

This toilet is a Water Sense toilet and it only uses 1.28 gallons per flush and no more. The tank is never going to completely drain with this low flush toilet. It is designed that way. Make sure the tank is filling to the fill mark inside the tank. If not adjust the fill valve until it does. Federal law says that a toilet can use no more than 1.6 gallons per flush. If you can take this toilet back and get a refund I suggest you do so and buy a Toto toilet. They are the best flushing toilet on the market. Watch it in action. http://www.youtube.com/watch?v=CmuzFve6O4k&feature=related

You have two issues inside of the toilet tank. The holding down the button is caused by your chain not being tight enough from the handle to the flapper. Take the slack out of that and replace the flapper. The second is that you need to replace the fill valve. This is what is making the noise when the tank is being refilled, and will have to be adjusted after it is installed.
Please remember to rate this.

No you just need a new flapper for your flush valve. Its just a 2 minute job.