Fix a Running Toilet...Fill Valve Replacement -- by Home Repair Tutor

Introduction

In this tutorial, we will guide you through the process of fixing a running toilet by replacing the fill valve using Fluidmaster’s 400H model. This is a common issue in many homes, and learning to replace the fill valve can save you time and money. Follow these steps to ensure your toilet runs efficiently and quietly.

Step 1: Turn Off the Water Supply

• Locate the shut-off valve, usually situated near the base of the toilet.
• Turn the valve clockwise to shut off the water supply.
• If the shut-off valve is broken, turn off the main water valve for the house.

Step 2: Empty the Toilet Tank

• Flush the toilet and hold the lever down until most of the water drains from the tank.
• Use a sponge or cloth to soak up any remaining water in the tank.

Step 3: Remove the Old Fill Valve

• Place a bucket under the toilet to catch any residual water.
• Unscrew the water supply line connected to the old fill valve. Use Channellock pliers if needed.
• Remove the nut securing the old fill valve and pull it out from the tank.
• Detach the hose connected to the old fill valve.

Step 4: Prepare the New Fill Valve

• Inspect the gasket on the new Fluidmaster 400H fill valve to ensure it is in place.
• Insert the new fill valve into the tank.

Step 5: Adjust the Height of the Fill Valve

• Measure the height of the fill valve:
  • The top of the fill valve should be approximately 3 inches above the top of the flush valve.
  • The top of the flush valve should be 1 inch below the tank lever location.
• To adjust, turn the black column of the 400H clockwise or counterclockwise.

Step 6: Secure the Fill Valve

• Cut the hose to the appropriate length so it does not interfere with the tank lid.
• Insert the hose into the clamp and attach it to the flush valve.
• Secure the fill valve to the bottom of the tank using the provided nut. Hand-tighten to ensure a snug fit.

Step 7: Reconnect the Water Supply Line

• Hand-tighten the water supply line to the bottom of the 400H fill valve.

Step 8: Turn On the Water Supply

• Slowly turn the shut-off valve counterclockwise to restore water flow.
• Observe for any leaks at the connections.

Step 9: Adjust the Water Levels

• Allow the tank to fill and check the water level:
  • It should be about ½ inch below the top of the flush valve pipe.
• Adjust the tank water level using the adjustment knob on the fill valve.

Step 10: Check the Toilet Bowl Water Level

• Make a pencil mark just above the water line in the bowl.
• Pour one gallon of water slowly into the bowl.
• Flush the toilet and see where the water line refills:
  • If it’s above the pencil mark, reduce the water level.
  • If it’s below, increase the water level using the adjustment knob.

Conclusion

Replacing a fill valve is a straightforward task that can significantly improve your toilet’s performance. With the Fluidmaster 400H, you can expect quieter operation and better flushing power. If you have any questions or need further assistance, feel free to ask. Happy fixing!