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Fluidmaster Fix It Zone

TOILET SYMPTOM:

Toilet Doesn’t Fill Up Completely

If your 400A fill valve delays in turning on or the float cup sticks when you flush the toilet, a quick recommendation would be to raise the float cup up if the float cup is set to its lowest setting.

Other reasons your fill valve may delay in turning on include:

  • The top cap lever arm may be hitting or coming into contact with the tank wall or refill tube.
  • Mineral deposits have built up on the valve body and are causing the float to stick.
  • Older valves may need a new top cap seal

On new valves we recommend you do the following for each:

  • For the top assembly remove the top cap and reposition the top cap lever arm so that it is away from the back wall or the refill tube.
  • Clean the valve body with a damp cloth and some cleaner (vinegar will work also). It is also recommended that you remove the top assembly and let the float cup fall as low as it will go to clean the affected area.
  • Remove the top assembly and replace the top seal with model #242. You should be able to find this part at your local hardware store.

How to Remove the Cap Assembly

  1. If you are attempting this procedure while the valve is already installed in the tank, then it is necessary to first turn off the water and flush the toilet.
  2. With your right hand reach under the float cup and push it up. Keep your right hand under the float by grabbing the gray shaft and holding it tight.
  3. With your left hand grab the cap and at the same time place your thumb on the side of the gray lever arm (see picture) and twist both the cap and the lever arm counterclockwise 1/8th of a turn. You may need to press down on the cap while making a quick twist.
  4. The bottom hand is lifting up on the float cup, which raises the black arm under the top cap. The top hand is gripping the cap while the thumb is pressing on the raised lever arm.

  5. This should allow you to remove the cap assembly -- made up of the cap, gray lever arm, the white housing and seal -- from the rest of the valve.
  6. The bottom hand is lifting up on the float cup, which raises the black arm under the top cap. The top hand is gripping the cap while the thumb is pressing on the raised lever arm.