How to Fix a Running Toilet

A complete walkthrough on how troubleshoot the flapper, fill valve, and float

A running toilet can waste hundreds of gallons of water per day while running up your water bill—it can also just be super annoying to listen to the water trickle constantly. The best way to fix a running toilet is to start by diagnosing the problem. If the water flows constantly and spills into the overflow tube (the hollow piece in the middle), your fill valve is to blame. If the water isn’t overflowing, it’s probably your flapper. Finally, the water level itself could be to blame. In this article, we’ll show you how fix all of these problems and more.

[Edit]Things You Should Know

• Check the flapper if the water in the tank isn’t overflowing. Ensure that the chain is properly hooked and the flapper isn’t worn out.
• If the tank is overflowing into the overfill valve, the fill valve needs to be adjusted or replaced.
• The water level itself may require adjusting. This is easy with the adjustment screw on the fill valve (same with or without float).

[Edit]Steps

[Edit]Flapper

1. Jiggle the handle a bit to see if the water stops running. Sometimes, the water just keeps running because the chain connecting your handle to the flapper gets caught or knots up. If this is only a once-in-a-while kind of problem, try jiggling the handle after the water has filled the tank. If the water stops running, you’re good to go.^[1]
   
   • If this happens regularly, it’s a sign that your chain might be the wrong length. Open the tank and check how long the chain is running from the flapper to the handle.
     
2. Turn off the water and drain the toilet. Before you can check the flapper for problems, turn off the water to the toilet by twisting the supply line valve counterclockwise as far as it will go. Then, flush the toilet to drain excess water from the tank.^[2]
   
   • The flapper is a round rubber seal that stops water from draining from the tank and into the toilet bowl. When you flush the toilet, the chain pulls the flapper up so fresh water can fill the bowl.
     
   • Problems with the flapper are among the most common causes of a running toilet.
   • It’s almost positively the flapper’s fault if the water occasionally stops running and/or the water doesn’t overflow into the overflow valve (the hollow pipe in the middle).
3. Adjust the chain length if it’s too long or too short. The chain that pulls the flapper up can allow leaks if it’s too long or too short—the goal is to have a chain that looks like a J when the flapper is closed, but pulls taut and opens the flapper when you raise the handle fully. For too much tension, remove the hook on the handle and move the chain up 1-2 links. If the chain is too long too long, trim a few links with wire cutters and reattach it.^[3]
   
   • When the chain is too short, it will pull up on the valve when it shouldn’t, allowing water to drain constantly. When the chain is too long, it can get caught underneath the flapper and prevent a seal.
4. Remove the flapper and inspect it for damage, dirt, or warping. Remove the flapper by unhooking the sides from the pins at the bottom of the overflow tube. Inspect the flapper for mineral deposits, warping, discoloration, disintegration, and other signs of trouble.^[4]
   
   • You can clean a dirty flapper that’s got mineral buildup on it.
   • A flapper that shows other wear-related problems should be replaced.
5. Clean a dirty flapper with soap and water. Hold the flapper under a stream of running water and scrub the mineral deposits or junk off with a sponge or toothbrush. Add soap as needed to wear away any gunk. You can even soak the flapper in vinegar if you still can’t clean the flapper off.^[5]
   
   • When the flapper is clean, put it back in place. Attach the hooks on the side to the pins on the overflow tube.
     
   • Turn the water back on and let the toilet tank fill.
     
   • Listen for the sound of water running to see if that fixed the problem.
6. Replace a worn-out flapper with a new one. If the flapper is brittle and hard or doesn’t seal well after cleaning it, purchase a new one. Take the worn flapper to the hardware store and purchase a new flapper in the same style and with the same dimensions. You can also buy a universal flapper that will fit any kind of toilet.^[6]
   
   • To attach the new flapper, fit in into place and attach the hooks on the side to the pins on the overflow tube.
   • Turn the water back on and test the flapper to see that it’s functioning properly, and that the toilet isn't running.

[Edit]Fill Valve

1. Try adjusting the spline on the fill valve before doing anything else. Your fill valve may simply need to be adjusted. If you pull up on the spline and the water stops flowing, the valve is just out of whack. Grab a screwdriver and turn the screw on top of the spline counterclockwise to lower the fill valve’s sensitivity.^[7]
   
   • Your fill valve is the tall pipe structure on the left side of your tank. The spline is the vertical piece that sticks out towards the handle and moves up and down when you raise it.
   • This process is identical regardless of whether you have a ball float-style valve or one of the newer floatless valves.
2. Shut off the water and drain the tank. If the water still won’t stop pouring in from the fill valve, your fill valve is faulty and needs to be replaced. Close the valve that feeds into the wall and drain your tank by flushing it.^[8]
   
   • Put a bucket under the fill valve where your supply line feeds into the tank. You may end up spilling a little bit of water while you carry this repair out.
     
3. Disconnect the water supply line. On the outside of the toilet, there is a water supply line running into the tank (directly underneath the fill valve). Use a wrench or channel locks to gently unscrew the locknut securing the line in place. Once it’s loose, turn the screw counterclockwise by hand and remove it.^[9]
   
   • If that nut happens to be plastic, don’t use a wrench or channel locks. Just twist it off by hand.
4. Remove the original fill valve by unscrewing the safety nut. Once the supply line has been disconnected, you'll see a safety lock nut attaching the fill valve assembly to the toilet on the outside of the tank. Remove this by using an adjustable wrench (or your hand) to turn the lock nut to the left (counterclockwise). Once the lock nut is off, lift the old fill valve assembly out from the toilet tank.^[10]
   
   • Take the old assembly to the hardware store when you purchase the replacement. That way, you can be sure to get the right size and style fill valve for your toilet.
   • You can replace older ball float fill valves with more modern float cup style ones if you’d like. The float fill valves and the non-float fill valves are functionally identical—the non-floats are just easier to adjust.
5. Install the new fill valve and connect the water. Insert the new fill valve into the same place in the tank. Fit the valve into the hole in the tank where the water supply line comes in. Hook up the water supply line and tighten the nut in a clockwise direction to tighten it.^[11]
   
   • Don’t overtighten the nut so hard that you end up cracking or damaging the bottom of the valve. So long as the supply line is tight and leak-free, you’re good to go.
6. Clip the fill tube on to the overflow valve. The fill tube is the rubber pipe hanging off of the fill valve. Attach the fill tube to overflow valve. Position the fill tube so it’s draining inside the overflow tube, and not into the tank itself.^[12]
   
7. Adjust the float so the water rests below the overflow tube. Check the manufacturer’s directions to determine the correct float height for the fill valve you purchased. Use a measuring tape to measure from the bottom of the tank, and adjust the fill valve to the right height by turning the adjustment screw on the spline.^[13]
   
   • Test the fill valve when you’re done. Turn the water back on and check the water level. Make sure the fill tube isn't in the water, and listen that there isn't any water running. Adjust the float height if necessary.^[14]

[Edit]Float

1. Adjust the float ball fill valve. On top of the fill valve, there will be a screw attaching the float arm to the fill valve. When you turn this screw, you can adjust the height of the float. With a screwdriver, turn the screw a quarter turn counterclockwise to lower the float.^[15]
   
   • Flush the toilet and let the water in the tank refill. Check the water level.
   • Ideally, the water level should be below the top of the overflow tube. Continue adjusting the screw by quarter turns until the water level is right.^[16]
2. Lower the float on an old-school float handle. The water won’t stop running if the ball float isn’t positioned correctly. Look for an adjustment screw on the top of the fill valve. When you turn this screw, it will adjust the height of the float. Turn the screw a quarter turn counterclockwise to lower the float.^[17]
   
   • Flush and refill the toilet tank.
   • Check the water level.
   • Continue to make adjustments until the water level in the tank is below the top of the overflow tube.
   • Frankly, you can even just bend the metal float arm if you can’t get the ball to sit low enough.^[18]
3. Check the fill tube if the toilet runs intermittently. The fill tube is a small rubber pipe attached to the fill valve that fills the tank with water after it’s been flushed. This tube should always be above the water line and inside of the overflow valve. When the tank is full and running, make sure the hasn’t popped off and is floating in the water.^[19]
   
   • Some people have had success zip-tying the fill tube in place to keep it from popping off.

[Edit]Video

[Edit]Related wikiHows

• Fix a Flapper on a Toilet
• Fix a Loose Toilet Paper Holder
• Fix a Toilet Seal
• Fix a Leaky Toilet Tank
• Unclog a Toilet
• Fix a Slow Toilet
• Install a New Toilet Seat
• Fix a Toilet
• Pack a Water Shutoff Valve
• Install a Caroma Toilet
• Adjust Toilet Tank Handles

[Edit]References

[Edit]Quick Summary

1. ↑ https://www.bobvila.com/articles/toilet-repairs/
2. ↑ [v161144_b01]. 1 October 2019.
3. ↑ http://www.apartmenttherapy.com/how-to-fix-a-running-toilet-common-causes-easy-diy-fixes-200209
4. ↑ [v161144_b01]. 1 October 2019.
5. ↑ https://www.apartmenttherapy.com/how-to-fix-a-running-toilet-common-causes-easy-diy-fixes-200209
6. ↑ https://www.apartmenttherapy.com/how-to-fix-a-running-toilet-common-causes-easy-diy-fixes-200209
7. ↑ https://anyhourservices.com/blog?post=running-toilet-diy-fixes
8. ↑ [v161144_b01]. 1 October 2019.
9. ↑ https://www.artofmanliness.com/skills/manly-know-how/heading-out-on-your-own-day-19-fix-a-running-toilet/
10. ↑ https://www.popularmechanics.com/home/interior-projects/how-to/a25326/how-to-fix-a-running-toilet/
11. ↑ https://www.popularmechanics.com/home/interior-projects/how-to/a25326/how-to-fix-a-running-toilet/
12. ↑ http://www.planitdiy.com/how-to/plumbing/how-to-replace-a-toilet-fill-valve-video/
13. ↑ https://www.fluidmaster.com/wp-content/uploads/2016/12/400a_installation_instructions_english.pdf
14. ↑ [v161144_b01]. 1 October 2019.
15. ↑ http://www.home-repair-central.com/how-to-adjust-a-toilet-float.html
16. ↑ https://www.homerepairtutor.com/how-to-fix-a-running-toilet/
17. ↑ https://www.homerepairtutor.com/how-to-fix-a-running-toilet/
18. ↑ https://southendplumbingllc.com/why-jiggling-the-handle-stops-running-toilets/
19. ↑ https://www.ifixit.com/Wiki/Toilet_Troubleshooting

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