The fill valve, which is the toilet part that sits inside the tank that sends water to the bowl and replenishes the tank each time you flush, helps keep your toilet running efficiently. However, after some time it can become misaligned or worn, which can cause fill valve leaks or your toilet to run constantly, which can also increase your water bill.

Fortunately, replacing the fill valve is simple and affordable and can be done on your own with the following tips on how to replace fill valve.

how to replace fill valve

Step 1. Turn off the Water

The first step to how to replace fill valve is to turn off the water. To do so, simply find the shutoff valve located on the lower wall behind the toilet and then turn the valve handle clockwise to stop water flow to the tank.

If the valve handle is too tight, then use a wrench to loosen the handle and then finish turning the valve by hand.

Step 2. Drain the Tank

Next, flush the toilet to drain the tank. After draining the tank, use a towel or sponge to remove any water that remains. If the tank is too full, simply wait until you disconnect the supply line and then allow the excess water to empty into a bucket.

Step 3. Remove the Supply Line

If you are also replacing the supply line, then using an adjustable wrench, loosen the nut located at the bottom of the supply line.

Next, using adjustable pliers, loosen the nut located at the top of the supply line.

Once both nuts are loose, simply remove the supply line. Otherwise, simply loosen the nut located on the tank to remove just the top of the supply line.

Step 4. Remove the Fill Valve

There are two types of fill valves: a float ball system and a float cup system, so be sure to check which type of fill valve system your toilet uses before purchasing a new one.

To remove the fill valve, completely unscrew the loosened supply line nut from the underside of the tank. Place a small pan or bucket below the tank to catch any remaining water in the tank. Once you have removed the nut, then lift the fill valve to detach it. Place the old fill valve into the bucket as well as it may continue to leak water.

Step 5. Modify the New Fill Valve

First, apply the washer located on the inside of the new nut that screws to the bottom of the tank to the end of the fill tube on the new fill valve, which keeps the fill valve from leaking once it’s inside the tank.

Next, increase the collar length on the new fill valve until the indicator on the top of the valve extends at least one inch higher than the overflow tube.

Step 6. Connect the New Fill Valve

Once the new fill valve has been modified, place the valve into the opening of the tank with the float positioned towards the center of the tank.

With the new valve in place, press down on the valve shank, and using a wrench, screw the nut onto the bottom of the tank about a half to three-quarters of a turn so that it can still be removed by hand. Once the tank is filled with water, you can always adjust the nut later if need be.

Step 7. Connect the Refill Tube

Once you have the fill valve in place, next connect the refill tube inside the tank and then attach the adapter to the overflow.
Feel free to trim the refill tube if need be in order to avoid any entanglements.

Step 8. Attach the Supply Line

Next, connect one end of the new supply line to the shutoff valve using the adjustable wrench. Attach the other end of the line to the tank using the adjustable pliers.
If you are using the original supply line, then simply reattach the top of the line to the underside of the tank.

Step 9. Turn on the Water

With the new valve system in place, turn the water back on and allow the tank to fill. Once the tank is filled, check the floor around the shutoff valve to be sure there are no water leaks. If you notice any leaks, inspect that the nuts are securely attached to the supply line.

If you still notice leaking, turn off the water at the shutoff valve; flush the toilet to empty the tank, and then remove the top part of the supply line with a bucket underneath to catch any remaining water.

Next, remove the fill valve and be sure the seal on the bottom of the valve shank is securely in place. Replace the fill valve, the supply line, and the nut. Turn the water back on and inspect for leaks again.

If you still notice leaking, then you may need to replace the supply line.

Step 10. Modify the Water Level

Now that the new fill valve is securely in place, next adjust the water level so that it is just above the overflow pipe by pressing the adjustment clip and then adjusting the float down or up.
On some models, the float is modified by simply turning a screw located next to the float.

Step 11. Flush the Toilet

Flush the toilet to observe that the new fill valve system runs smooth and quietly.
If replacing the fill valve still does not address the issue, then retrace your steps on how to replace fill valve to be sure they were implemented correctly. Otherwise, you may need to troubleshoot further to determine the issue.

Wrapping Up

Replacing a fill valve is easy and quick with these simple tips on how to replace fill valve. So if your toilet requires a new fill valve, don’t put off the repairs waiting for a professional plumber, Instead, use these simple tips to restore your toilet to the proper working condition. If you have applied these tips on how to replace fill valve and have experienced success with repairing your toilet, feel free to share your story.

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