Toilet wont stop filling

ensure that the supply line is clear. shut angle stop valve off and remove line from bottom of tank place line into a pail and open angle stop valve, if clear water will flow quite readily. if not replace line. the fill valve is available at home depot. personally I would replace toilet with a quality American Standard. if your toilet is not a Glacier Bay good luck finding repair parts.

https://www.homedepot.com/p/Fluidmaster-Flapperless-Toilet-Fill-Valve-for-Glacier-Bay-Toilets-703AP4/202510398

check the overflow pipe in the cistern tank as some fill valves do not stop completely but allow input of water after the noise has stopped. This allows the water level to rise up and the water to flow out into the toilet bowl. Reduce the water level height by adjusting the cut off level and when the water rises past the new level the increase pressure on the valve will shut it off.

If I understand correctly, the tank that holds water is not filling up with water.

1) If this is the problem, then you need new toilet fill valve.
Or clean sediment out of existing fill valve by removing and soaking in CLR calcium rust lime.

To replace fill valve:
Look at water supply line coming into tank.
Supply line connects to fill valve.

Buy new fill valve at home center, hardware store, or walmart, or online.
There are two nuts connected to valve. Each nut has companion rubber washer

One nut & washer seal water supply line to tank.
Second nut & washer seal valve to tank.

2) If water tank is full of water, but water does not flow rapidly into bowl when you push flush lever, then your toilet is clogged with sediment.

To solve sediment problem when flush water will not flow rapidly into tank, then buy CLR calcium lime rust.
Pour CLR down into overflow tube located inside water tank.
Make a funnel by cutting off bottom of water bottle, or cut paper cup into a funnel.
Pour cup-full after cup-full of CLR into overflow tube until sediment and CLR are coming out all flush holes located under-rim on bowl.

3) Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Is the flapper valve slow to return to the closed postion allowing water to flow through the flush valve? Make sure the toilet flapper is moving freely and is sealing properly against the flush valve. If there is no lengthy or continual water flow in to the toilet bowl then this is not the problem.

Is the water valve on the water fill line to the toilet tank fully open? This may seem silly but it could be this simple.

Check to make sure your fill valve is opening fully. If you have an older toilet there may be some deposits that need to be cleaned way to allow free movement.

If toilet does eventually fill to the desired level, there is no leakage, water valve on fill line is fully open and fill valve is opening fully then recommend you shut off water supply, drain toilet and disconnect water fill line from the water valuve and toilet tanke to make sure there is not a blockage. If the water line and connections are clear you may need to remove the fill pipe in the tank and check for blockage. If this is very old, conisdering the cost and effort, it may be simpler to replace at this time rather than trying to extend the life.

You need to replace the gasket in the fill valve if it is a problem that was not there when it was new. If it is new? Check the water flow from the supply line to the toilet. Turn of the water to the toilet, remove water line from toilet, run water into a bucket to check flow. @ the bottom of the fill valve where the water connects, on the inside there may be a screen that in plugged

1- Check ports out under rim all round bowl.

2-Check tank fill level for required amount to with in 5/8" to top of over flow tube.

3-Make sure 1/4" fill tube is connected to over flow tube. From fill valve to overflow tube.

Below is a few details to go by I hope will be helpful for you to take care of this problem.


Under the rim of the bowl check the ports and make sure they are not stopped up. You can open them up with nail or pin to clean out ports.
Next check tank level and make sure the fill valve has a line run from it to top of the overflow tube. This line allows water to goe to bowl and tank to fill required amount needed.
Water in tank should be within 5/8" to top of over flow tube.

I don't exactly know what you mean so i will cover all the basics. The fill valve sends fills water in 2 locations. 1) the fill valve fills at the low end (from the bottom to the top) of the tank. This is the flush water level. It needs to be stopped by a float switch before the water overflows into the over flow tube.
2) the fill valve fills water via a small tube at the top of it which this tube NEEDS to be pointed into the overflow tube with a high arch. THIS water is filling your toilet bowl section to proper flushing height. If your water in your bowl does not reach proper height and someone removes this tube to aim it into the tank where the other water is stored, THEN you may have the problems you described and you will need to do several flushes to remove waste.
SO to reiterate 1) make sure your float cuts off and stops the filling cycle before the water flows into the over flow tube. This is done from 1 or 2 adjustment screws. and 2) make sure the small black tube is aimed down into the over flow tube with a good arch. The arch prevents back siphon.

for the upstairs if the valve is fully on there is not much you can do other than replace water service to the house or heaven forbid repipe.Valves usually don't restrict fill volume.But you can take the supply loose from the tank and stick it in a bucket turn the valve on and check the flow.this should narrow it down.Down stairs repair or replace flush valve

Remove the tank lid and look at the fill valve. Is it a yellow valve?
This fill valve is common on the Toto Toilets and can easliy plug with debrie.

They can be disassmbled and cleaned. however, I usually just replace the valve with Fluid Master Fill valve.
You will also want to check the water coming into the toilet by turning off the water that supplies the toilet and disconnecting the water supply line. After removing the water supply line turn on the water at the valve to make sure that the water is flowing properly. Check the supply line also to make sure it is not plugged.
Be sure and place a small container to catch the water that will come from the valve. A towell will also help from making too much of a mess.
If the Supply line and the valve are clear the problem is in the fill valve.
The G-Max system denotes the Flushiing system which is a 3" flapper that allows the water from the tank to flow into the bowl quicker.
Good Toilets!

sanray