Toilet Tank Not Filling Up After Flush

Quick answer

Turn off the water supply under the toilet. Check the fill valve for clogs or damage and replace if needed. Ensure the float arm isn't stuck or misaligned.

Confirm the symptom

• Toilet tank doesn't refill after flushing
• Water shuts off immediately after flush
• Toilet bowl water level drops but tank doesn't refill

Tools and prep

• Adjustable wrench
• Screwdriver
• Plumber's putty
• Replacement fill valve or flapper
• Bucket or towel
• Turn off water supply valve
• Wipe up any spilled water before starting

Step-by-step troubleshooting

1. Check Water Supply Valve
   Do: Locate and ensure the water supply valve under the toilet is fully open.
   Observe: Water flows freely to the tank.
   Means: Valve is open and functional.
   Next: If valve is closed, open it and wait 10 minutes to see if the tank fills.
2. Inspect Fill Valve
   Do: Look inside the tank for the fill valve. Check for clogs, cracks, or damage.
   Observe: Fill valve is clogged or damaged.
   Means: Valve needs cleaning or replacement.
   Next: Clean the valve or replace it with a new one.
3. Adjust Float Arm
   Do: Check the float arm to see if it's stuck or misaligned.
   Observe: Float arm moves freely and reaches the correct water level.
   Means: Float arm is functioning properly.
   Next: Adjust the float arm if it's misaligned.
4. Test Flapper Valve
   Do: Press down on the flapper valve to see if it seals properly.
   Observe: Water leaks from the tank to the bowl when the flapper is pressed.
   Means: Flapper is worn or damaged.
   Next: Replace the flapper valve.
5. Check for Clogs in Inlet Tube
   Do: Inspect the inlet tube for mineral buildup or clogs.
   Observe: Inlet tube is clogged with debris.
   Means: Inlet tube needs cleaning.
   Next: Clean the inlet tube with a wire or replace it if necessary.
6. Verify Tank Water Level
   Do: Check the water level in the tank. It should be about 1 inch below the overflow tube.
   Observe: Water level is too low or too high.
   Means: Adjust the float arm or fill valve to set the correct water level.
   Next: Adjust the float or fill valve as needed.

Common causes

Parts matching

Common parts needed for a toilet tank not filling up after flush:

• Fill valve: Controls water flow into the tank.
• Flapper valve: Seals water in the tank until flushed.
• Float arm: Regulates the water level in the tank.
• Inlet tube: Connects the water supply to the fill valve.

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

When to call a professional

• The tank still doesn't fill after replacing the fill valve and flapper.
• Water continues to leak from the tank despite repairs.
• You notice cracks or damage to the toilet tank itself.
• The issue persists after multiple attempts to fix it.

FAQ

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