What is square box (float) attached to flush valve inside tank

Hi Nathan:
If you lift the tank lid off and flush the toilet you will see that a flapper valve lifts to let the water drain from the tank. The flapper valves are designed to stay in the closed position when the tank fills, but to float when the tank is flushed.
The problem will probably be that the flapper valve no longer floats due to saturation with water, or a leak that has allowed water inside the float.
The fix is to replace the float valve. Parts are available at most hardware and plumbing supply stores.
Cheers

the fill valve is not letting water in you either have a float that raises up when water is full so when you flush the float drops down letting water in then when water raises it shuts off i would replace the float fill valve and corky flapper.... here is what you do .... first shut water off where it goes up to the tank....... flush commode to empty as much water from tank....... reach up under tank there is a plastic coupling that connects the water supply line to the bottom of the toilet tank...put a small pan under the shut off valve that goes to the toilet some water is going to drain from the tank when you take the coupling loose..... turn the coupling counter clockwise ( use a channel lock adjustable wrench to loosten then had turn) once this is loose you can pull the riser tube away from the tank...... now there is a plastic nut that screws the shaft to the bottom of the tank loosten with channel lock then remove with hand by turning counter clock wise ( you will get a bunch of water flowing down to the pan) remove the entire fill valve , replace with a fluidmaster fill valve ( about 8 bucks from big box store when you take the new fill valve out of the box there is a neopreme seal you must put on the new threaded shaft ( it has an inner ring you may have to punch out) once you put this on you can insert the entire shaft down through the hole in tank then secure with thin nut provided tighten but do not overtighten then put coupling back on,,,,,put the over flow tube on the tit of the fill valve and stick down into over flow ok thats done when you go to big box store purchas a 5 buck corky flapper (red caus it can handle chlorine water better) remove the old one at bottom of tank( just two clips to remove and chain attached to flush lever...install new one be shure chain does not have a lot of slack so it does not fall under flapper seal when you flush......OK YOU ARE DONE TURN WATER ON WATCH TANK FILL LOOK FOR LEAKS TAKE A TOWEL AND DRY ALL AREAS THEN TAKE YOUR HAND AND FEEL FOR LEAKS UNDER TANK AND DOWN TO SHUT OFF VALVE .....CONGRATS YOU DID IT!

Is your supply valve on below the toilet? Maybe the float inside the tank is stuck in the up position? Or else the float valve is stuck. Shut off the supply valve below the toilet tank. Take off the line going to the tank. Slowly open up the valve a little does water come out? If it does, I would replace the float assembly with a new one. If there is no water, then the problem is in the plumbing going to the supply valve in your house. Good luck and please rate my answer so I get points

There should be a float inside the tank of the toilet. Be sure that when the tank fills that the float is not getting stuck, or not floating all the way up and not sealing the flush valve at the bottom of the tank.

Hi there terminator,

Inside the tank, directly above where the water hose is attached, is the valve mechanism. Attached to this valve there is a float.

As the water level rises so does the float. When it get high enough, the float valve shuts off the water.

The idea is to lower the float so the water is turned off sooner.

If your model has a ball on a metal arm, it is as simple as bending the arm down a little bit.

Vertical cylinder types have adjustments on them.

Then there is the simplest solution which is to put a couple of bottles full of water in the tank to take up space. Therefore less water is needed to fill it...

Best regards

Mike

The overflow pipe should be attached to a small clip that holds it in position over the over flow pipe. If it is loose or attached to the outside it will do what yours is doing.

ok, this sounds like a float or valve issue, should be an easy fix. you can adjust the float or just replace it with the one piece type. you may not be able to adjust it and get it to work, so I think the best thing to do is just replace the whole float assembly. About ten dollars or so at home depot or someplace like that. Turn off the supply valve, flush the toilet,and drain the tank by removing the plastic nut underneath on the left side. Drain the remaining water into a bowl. There is also a nut on the supply line that will need to be removed first. When you remove the nut that is flush with the bottom of the tank that also holds the valve in place inside. Take off the rubber hose inside the tank and remove the entire float and valve. The new one piece will have a adjustment for the tank level by just turning the entire unit. Make sure you put the rubber washer that is supplied with it on the bottom and put it back into the tank and tighten from the bottom with the new plastic nut. Make sure the valve inside is pointed at the plastic tube and re-attach the rubber hose. Then attach the supply line, tight, but not with a tool, just your hand. Turn on the supply valve, re-fill the tank, flush, and check for leaks. Remember, buy the one piece type, should be a gray valve with a black float built right on it. Good luck

I would ckeck to see where water fill line is inside toilet tank and then adjust flush valve to try to get it to shut off at this point. Not knowing whether your toilet still has original flush valve it is hard to tell you how to fix it. If it has float mounted on rod to flush valve there is usually a set screw on the top of the flush valve in the center. Turn this screw clockwise to make valve shut off sooner. Try to set it so that water shuts off when it is at fill mark. If float is mounted on brass float rod you can support rod closest to flush valve with left hand and carefully bend rod down a little with your right. This will cause flush valve to shut off sooner. If the seat is worn to badly in flush valve you will need to replace it.

adjust the float level,it's a rod attached to lever next to float . i believe it will take a screw driver, look closely there is a+/- indicator

Readjust the float. the longer it is the more leverage the fill water will have on it. good luck. The fill valve does come apart and cleaned if there is debri in it. Turn the water off first:)