Make sure the float can rise and fall freely. If it's up against the side of the tank, it could get caught and remain in a position where the fill valve will remain open. Move it so it can remain at the top of the water level and get high enough to shut the fill valve.
Take a crescent wrench to the ``bonnet'' of the new shut off, the little nut behind the handle, loosen that then loosen the handle, the guts of the shut off will come Out. Toss the metal body you won't need it. Repeat this process on your shutoff valve behind the toilet. Then tighten it back down, close the handle.
The water level inside the tank is controlled by an adjustable float. If the float is set too low, it creates a weak flush. If it's set too high, water will spill into the overflow tube and continually run. Look for a fill level mark on the inside back of the tank and mark it on the overflow tube so it's easily seen.
Check Handle and Flapper: If your fill valve and fill height are just fine, move on to the handle and flapper. If the chain that connects your handle to the flapper is too short or becomes tangled, the flapper won't close and the water will continue to run.
Adjust the flush handle/flapper chain
A chain that's too short or tangled won't allow the flapper to close and water will continue to leak into the bowl. This causes the fill valve to cycle on and off to refill the tank.
If the water in your toilet tank fills with water or runs at seemingly random times, it has a slow leak. This is wasting water and needs to be fixed. The most likely cause of this leak is a bad flapper or flush valve. A flapper is rubber and will degrade over time due to minerals and chlorine in the water.
A continuously running toilet can waste up to 200 gallons a day or more depending on the volume flow down the drain. This can cause a terrible increase to a family's typical water use, so fix toilet leaks as soon as possible. Some leaks are easy to find, such as a dripping faucet or running toilet.
Use of the Day: Keep valve stems and faucets rust-free by spraying them with WD-40.
Rebuilding a shut-off valve is a simple first step that you can take to fix problems with your sink or toilet. With a stem repair kit and a few basic tools, the job is a DIY project that doesn't take very long.
Use a Spray Lubricant: You can use WD-40, which won't damage the rubber washer. Spray it onto the valve and leave it for 10 minutes. You should then be able to turn the valve.
Valve Replacements: Valve replacements cost $50–$150 and resolve noisy or slow toilets. The fill valve refills the tank after each flush, the shut-off valve controls water flow, and the flush valve controls water coming from the tank to the bowl.
What happens if a toilet runs all night? If a toilet runs all night it will waste water and increase your water bill. Excess water can potentially flood your septic tank and lead to failure and saturation of your drain field.
Adjust the Float
This can lead to an overfilling of the tank, which then triggers the fill valve to continuously run. This causes a constant flow of water into the tank and ultimately, into the bowl. Adjusting or replacing a float on a toilet is a relatively simple task that can fix a toilet from constantly running.
Replacing a toilet valve can be a DIY project manageable with basic tools like wrenches and pliers. However, if the valve system is complicated or the problem persists after trying to fix it yourself, it's best to call a professional plumber to ensure everything is correctly fixed.
If your toilet keeps running, it could be because the float height requires adjustment. The water level in the tank below the toilet bowl controls how often it drains and fills. If this level is too low, the water will drain continually and run through the overflow tube into the bowl.
If the flapper is worn or the seat that the flapper rests on is damaged, the water level will stop just below the flapper. If the gasket that seals the flush valve into the tank is deteriorated and leaking, the water would most likely drain completely out of the tank.
Debris that builds up over time inside the water system, including the valve body, supply line or shut off valve (at the wall) can restrict the flow path of water and slow down the valves filling speed. Toilet fill valves in use for a period of 7 years or more can have their working parts start to wear out.