How to Stop a Running Toilet Tank

how to stop a running toilet tank

If you detect the sound of water flowing within your toilet even when it hasn’t been flushed, there’s a strong possibility of a leak. The solution is straightforward, and here’s a step-by-step guide to how to stop running a toilet tank. Here are the tools and materials you’ll need. 

running toilet tank

The first task is to identify the source of the leak, which typically stems from two components: the fill valve or the flapper. Begin by removing the lid of the toilet tank and placing it on a stable surface to avoid damage.

If you observe a constant flow of water into the tank and down the overflow tube, it’s likely that your fill valve requires adjustment or replacement. If the water intermittently runs without entering the overflow, a new flapper might be necessary.

Let’s start by examining a potential issue with the fill valve. Try this simple test: raise the float cup and check if the water flow ceases. If it stops, the float might just need adjustment.

Modern fill valves often feature a long spline along the side. To adjust, turn the screw counterclockwise to lower the float cup and bring the water level below the overflow tube.

If this doesn’t resolve the problem, it’s time to replace the fill valve.

First, shut off the water supply using the stop valve located behind the toilet. Flush the tank to eliminate as much water as possible, and use a shop vacuum to remove any remaining excess water.

Position a cup or bowl beneath the valve to catch any extra water.

Locate the supply nut at the tank’s base that allows water to flow into the fill valve. Loosen it by turning counterclockwise. Using adjustable pliers, unscrew the fill valve retaining nut located at the tank’s base by turning it counterclockwise.

Disconnect the fill tube from the overflow and lift the entire fill valve out of the tank.

Now, you’re ready to install the new fill valve. Place the rubber washer at the bottom of the fill valve assembly with the cone of the washer facing downward. Position the new fill valve into the tank hole and secure it with the retaining nut. Turn the nut clockwise with pliers, taking care not to overtighten. Reattach the supply line nut and hand-tighten it.

Attach the fill valve tube to the designated holder over the top of the overflow tube. Turn the water supply back on using the stop valve.

Now, let’s address an intermittent leak caused by a faulty flapper. Initially, turn off the water supply at the shut-off valve. Reach into the toilet tank and gently detach the flapper from the two studs on either side of the flush valve.

Remove the chain from the flush handle lever. Install the new flapper by aligning the holes on each side over the two studs. Attach the chain to the flush handle lever, ensuring it doesn’t pull the flapper open.

Turn the water supply back on and flush the toilet to confirm if the leak is resolved. If the flapper doesn’t seal properly, adjust the chain length accordingly. Lastly, replace the toilet tank lid.

And there you have it! Your troublesome toilet leak is now fixed.