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1.) Check to make sure that the water shut-off valve is all the way open (the water valve a.k.a. the shut-off valve is located behind the toilet near the wall or the floor, depending upon installation placement.) The water supply line attaches to it and feeds up into the refill valve assembly inside the toilet tank.
2.) Check the float assembly or the refill valve assembly, make sure it hasn't bound up by getting caught on another part inside the tank.
3.) Check the water level to make sure that it sits about 1 inch below the overflow tube in the middle of the tank. If the water is lower, adjust the float inside the tank to raise the water level. For models that have a ball float, turn the screw on top of the fill valve clockwise to raise the water level. For models that contain a cylinder float valve attached to the fill valve, squeeze the clip on the side of the float and pull the float up until the water reaches the desired level.
If the flapper and all has been replaced. then it must be worn out where the flapper sits. or its not smooth.check to make sure it is smooth where the flapper closes, and make sure it closes fully when flushed. you might be better off with a new toilet, but thats up to you!
If you manually pull up on the float of the fill valve will it then shut off? If it does, most likely your water pressure is too high, should be around 60 psi. More then 80 and it won't shut off. You may need to add a restrictor to the fill valve. Most fluid-master units come with one already installed, you could try one of them.
There are only a coulple of places that the toilet could leak or, overflow and give you this problem. When you replaced the flapper valve, did it have an extra piece of rugger on it? Universal flappers have a round piece on them that are designed to fit over the overflow tube. If you flapper had this piece and you don't have need for it, you need to cut that out, if the flapper "hooks" to the overflow assembly. Leaving that piec on can contort the shape of the flapper and make it so it won't seal. If you are noticing constant movement(slight swirl) in the bowl, make sure the back tank is not constantly overflowing into overflow tube. If this is the case, your water level is too high. You will either need to adjust the water level and/or replace the fill valve. If you can hear the toilet running or leaking, push down on the flapper, if it stops, you have a problem with the flapper and/or the chain adjustment. When you install the flapper, you have ton make sure the chain is long enough to let the flapper fall and seal but, not so long that it can tangle or get between the the flapper and it's seal below it.
Is the drip comming from the small fill tube going into the overflow? If so you may need to raise it a little. The nost common leak is from the flapper or seal. On rare occasioms the flush valve itself has a defect that will cause it to leak. Take a close look at the problem and Im sure you will find it. I hope this helps.
There are many different fill valves out there so it would be a little hard to tell you how to adjust your particular one without knowing the brand and type of the fill valve.
So I will give you a generic adjustment.
Look for someway/something to adjust your float in the toilet tank.
There should be a screw, moveable metal, something that will adjust your float.
Once you locate the adjustment, you can then adjust your water level in the toilet tank.
Adjust the water level in the toilet tank to be about a 1/4-1/2 inch before it flows out of the overflow tube when the water shuts off.
Good Luck, I hope this helped.
Please rate me, Thanks
As long as there is no water leaking from the tank to bowl connection, you are OK. You would know if it was leaking here, because you would have water dripping out onto the floor.
Verify that the water level in your tank is below the top of your new flush valve's overflow tube. If the water level comes to the top, it will overflow into the toilet bowl. This can be easily fixed with an adjustment to the fill valve.
If the water is not overflowing into this tube, then the only way you can lose water is through the flapper. You said you changed the flush valve, which would have come with a new flapper attached to it, but maybe buy a new flapper and see what happens???