Toilet Overflow Tube Keeps Running

Quick answer

A running toilet overflow tube is usually caused by a faulty fill valve. Turn off the water supply, adjust the float, or replace the fill valve to stop the water from continuously running.

Confirm the symptom

• Water is constantly running into the overflow tube
• Toilet tank fills but doesn't stop
• You hear water running even when the toilet isn't being used

Tools and prep

• Adjustable wrench
• Screwdriver
• Replacement fill valve (if needed)
• Plumber's putty (if needed)
• Turn off water supply to the toilet
• Protective gloves

Step-by-step troubleshooting

1. Turn off water supply
   Do: Locate and turn the shut-off valve clockwise to stop water flow.
   Observe: Water stops entering the tank.
   Means: Valve is closed.
   Next: Drain the tank
2. Drain the tank
   Do: Flush the toilet to empty the tank into the bowl and hold the handle down to drain as much water as possible.
   Observe: Tank is mostly empty.
   Means: Tank is drained.
   Next: Inspect the overflow tube
3. Inspect the overflow tube
   Do: Check the float ball or cup for damage and ensure it's moving freely.
   Observe: Float is intact and moves freely.
   Means: Float is functioning properly.
   Next: Adjust the float
4. Adjust the float
   Do: Raise or lower the float to the correct water level, ensuring it triggers the fill valve to shut off.
   Observe: Water level is about 1 inch below the top of the overflow tube.
   Means: Float is properly adjusted.
   Next: Test the toilet
5. Test the toilet
   Do: Turn the water supply back on and let the tank fill.
   Observe: Water stops filling at the correct level and doesn't run into the overflow tube.
   Means: Adjustment was successful.
   Next: Monitor for leaks or continued issues
6. Replace fill valve if needed
   Do: If adjusting the float doesn't work, replace the fill valve with a new one.
   Observe: Water stops filling properly after replacement.
   Means: Fill valve is functioning correctly.
   Next: Test the toilet again

Common causes

Parts matching

Common parts needed for fixing a running toilet overflow tube:

• Fill valve – Replaces a faulty fill valve
• Float assembly – Fixes a stuck or damaged float
• Flapper – Replaces a worn flapper causing leaks
• Adjustment tool – Helps set the correct water level
• Plumber's putty – Seals the float ball if needed

Purchase parts that are compatible with your toilet model for the best results.

When to call a professional

• The toilet continues to run after replacing the fill valve
• You notice significant water damage or mold growth
• You're unsure about the correct part for your toilet model
• The problem persists after multiple attempts to fix it
• You hear unusual noises from the toilet that indicate a deeper issue

FAQ

Related guides

• toilet flapper replacement

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