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How to Fix a Toilet That Runs Constantly | Stop the Wasteful Flow in 2024


Well, we are here to explain an important topic that you need an issue for. The topic is How to Fix a Toilet That Runs Constantly. We are writing this with our many years of plumbing experience.

A constantly running toilet is not just an annoyance; it’s also a costly waste of water that can result in higher water bills. Fortunately, fixing this issue is often within reach and can be accomplished with a few simple steps.

In this guide, we’ll walk you through the process of identifying the culprit causing your toilet to run and provide practical solutions to resolve the problem. Whether it’s an issue with the overflow tube, flush valve, or fill valve, we’ll guide you through the troubleshooting process to help you save water and money.

If you can’t fix this issue yourself, then you need an expert team to solve this very early and urgently. That’s why we are here for you, ‘Plumbers Sherman TX‘, to provide emergency service very soon. We are based in Sherman, TX.

How to Fix a Toilet That Runs Constantly

A running toilet is typically caused by problems with three main components inside the tank: the overflow tube, flush valve, and fill valve. Let’s explore how to troubleshoot and fix each of these issues.

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Running Toilet Causes

Overflow Tube:

  • The overflow tube is designed to prevent the toilet tank from overflowing.
  • If water continuously flows into the overflow tube, it might indicate an issue with the flush valve or water level.

Flush Valve:

  • Responsible for releasing water into the toilet bowl when flushed.
  • A common reason for a running toilet involves problems with the flush valve.
  • Easy to repair and suitable for a DIY project.

Fill Valve:

  • Controls the flow of water into the tank from the main water supply.
  • A faulty fill valve may lead to a toilet that keeps running non-stop.

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Finding the Source of the Problem

To identify the source of the problem:

  • Put a few drops of dye into the tank.
  • If the colored water flows into the toilet bowl, the issue is likely with the flush valve.
  • If the water in the toilet bowl remains clear, the problem may be related to the fill valve or overflow tube system.

How a Toilet Works

Understanding the basic workings of a toilet is crucial for troubleshooting:

  • Water enters the tank through the fill valve, and the flapper prevents it from exiting.
  • The float rod rises with the water level, and the fill valve stops the water flow when the set level is reached.
  • The toilet is flushed by pulling on the handle, opening the flapper, and releasing water into the bowl.
  • Water continues to flow until the tank is empty, and the flapper seals the tank.

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What You’ll Need

  • Channel-lock pliers
  • Bucket
  • Towel, cloth, or sponge
  • Screwdriver
  • Replacement parts: flush valve, flush valve chain, fill valve

Repairing a Constantly Running Toilet

Replacing the Overflow Tube

Check the Water Level

  • Ensure the water level is below the overflow tube.
  • Adjust the float rod or float cup to lower the water level.

Verify Overflow Tube Height

  • Replace the overflow tube if it’s too short, causing continuous water flow.

Replacing the Flush Valve

Check the Chain

  • Ensure the chain is the right length to allow the flapper to close and open properly.

Inspect the Flapper

  • Replace a damaged or worn flapper.
  • Clean a dirty flapper with a water and vinegar solution.

Replace the Flush Valve

  • Turn off the water, drain the tank, and remove the old flush valve.
  • Install the new flush valve and test for leaks.

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Replacing the Fill Valve

Verify Fill Valve is Faulty

  • Check the water level and overflow tube height.
  • Replace the fill valve if it continues running into the overflow tube.

Turn Off the Water and Drain the Tank

  • Turn off the water, flush the toilet, and soak up excess water.

Unscrew and Remove Assembly

  • Remove the old fill valve assembly.

Install the New Fill Valve

  • Adjust the height of the new fill valve.
  • Secure it to the tank and reconnect the water supply.

Connect the Fill Tube

  • Attach the fill tube and clip it onto the overflow pipe.

Test the Toilet

  • Flush the toilet and check for leaks.

When to Call a Professional

  • If water overflows or is close to the rim while running, or if issues persist after repairs, consult a plumber.

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Frequently Asked Questions

Can a running toilet increase your water bill?

Yes, a continuously running toilet can waste gallons of water, resulting in higher water bills.

Will a running toilet eventually stop?

No, a running toilet won’t stop on its own. It requires prompt repair to prevent water wastage.

What are the signs of a toilet going bad?

Constant repairs, frequent clogs, poor flushing, visible cracks, and puddles indicate a toilet may need replacement.


Fixing a toilet that runs constantly is a manageable DIY task, and understanding the key components involved makes the process more accessible. By addressing issues with the overflow tube, flush valve, or fill valve, you can conserve water, save on your water bill, and ensure your toilet functions efficiently. If you encounter challenges or prefer professional assistance, don’t hesitate to seek the expertise of a plumber.

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