Toilet Not Refilling: Fix It Now

Quick answer

If your toilet isn't refilling after flushing, check the water supply valve under the tank and ensure it's fully open. Inspect the fill valve for blockages or wear and replace if needed. Adjust or replace the float if it's stuck or damaged.

Confirm the symptom

• Toilet tank doesn't refill after flushing
• Water level in tank is consistently low or empty
• Toilet runs continuously but doesn't refill properly
• No water enters the tank after a flush

Tools and prep

• Adjustable wrench
• Screwdrivers (flathead and Phillips)
• Plumber's putty or silicone sealant
• Replacement parts (fill valve, float, flapper)
• Turn off water supply to toilet before starting
• Paper towels or cloth for cleanup
• Bucket to catch water if tank is full

Step-by-step troubleshooting

1. Check Water Supply Valve
   Do: Locate the shut-off valve under the toilet tank and ensure it's fully open.
   Observe: Water should flow freely when the valve is open.
   Means: If water doesn't flow, the valve may be closed or clogged.
   Next: Clean or replace the shut-off valve if necessary.
2. Inspect Fill Valve
   Do: Look inside the tank to check the fill valve for debris or damage.
   Observe: Fill valve should move freely and not be obstructed.
   Means: A clogged or faulty fill valve prevents water from entering the tank.
   Next: Clean the fill valve or replace it if damaged.
3. Adjust or Replace Float
   Do: Check the float for damage or improper positioning.
   Observe: Float should rise with the water level and shut off the fill valve at the correct height.
   Means: A stuck or damaged float can prevent the tank from filling properly.
   Next: Adjust the float arm or replace the float assembly.
4. Check Flapper Valve
   Do: Inspect the flapper for wear or damage.
   Observe: Flapper should create a tight seal when closed.
   Means: A faulty flapper can cause water to leak into the bowl, preventing the tank from refilling.
   Next: Replace the flapper if it's worn or damaged.
5. Test Water Level
   Do: Ensure the water level in the tank is about 1 inch below the overflow tube.
   Observe: Water should stop filling at the correct level without overflowing.
   Means: Incorrect water level settings can lead to improper filling.
   Next: Adjust the fill valve or float to set the correct water level.
6. Inspect for Leaks
   Do: Check the base of the toilet and connections for water leaks.
   Observe: Look for dampness or puddles around the toilet base.
   Means: Leaks can indicate a cracked tank or wax ring issues.
   Next: Repair or replace damaged components if leaks are found.

Common causes

Parts matching

Common parts needed to fix a toilet not refilling include:

• Fill valve (also called a ballcock)
• Float assembly or float cup
• Flapper valve
• Shut-off valve
• Adjustable water level clip or screw
• Plumber's wax ring (if base leak is present)

Purchase parts specific to your toilet model for compatibility. Check the manufacturer's website for part numbers.

When to call a professional

• Water continues to leak after replacing parts
• Toilet base is cracked or severely damaged
• Persistent low water pressure in the tank despite adjustments
• You're unsure about the correct part or installation process
• Multiple repairs have failed to resolve the issue

FAQ

Related guides

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