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Locate and Understand the Adjustment Mechanism — Adjust the Float Cup

Beginner30 mins

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How to Stop a Constantly Running Toilet by Adjusting the Fill Valve Float · Step 3 of 5

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In this video

Identify the fill valve assembly, which is the tall mechanism that the water supply line from the wall connects to. On top of this valve, there will be an adjustment screw. For older styles with a float ball, turning this screw adjusts the angle of the float arm. To lower the water level, you will turn the screw clockwise. To raise the water level, turn it counter-clockwise. A screwdriver can be used if the screw is tight, but it can often be turned by hand.

Goal: Identify the adjustment screw and understand how to use it.

  • A text overlay in the video notes that a screwdriver can be used for this step.

Used in this video

  • Screwdriver (Tool Type: Screwdriver, Power Source: Manual) · optional — Turning the adjustment screw on the fill valve if it cannot be turned by hand.
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FAQs

What specific tools will I need to adjust the fill valve float?

For most modern fill valve adjustments, you typically won't need specialized tools beyond your hands. Some older or specific fill valve types might require a flathead or Phillips screwdriver to loosen a lock screw or a pair of pliers to gently turn a locking nut. Always have a towel handy for any minor spills.

Do I need to turn off the water supply to the toilet before adjusting the float?

While not strictly necessary for simply adjusting the float, it's a recommended safety measure, especially for beginners. Turning off the water at the shut-off valve behind the toilet prevents accidental overflows if you inadvertently displace a component. Remember to turn the water back on fully after testing your adjustment.

How do I know if I've adjusted the float to the correct water level?

The ideal water level is typically about 1 inch below the top of the overflow tube in the tank. After each adjustment, flush the toilet and observe the water refilling. The fill valve should shut off completely once the water reaches this level, and the toilet should remain silent without any trickling sound.

What should I do if adjusting the float doesn't stop the toilet from running?

If adjusting the float doesn't resolve the constant running, the problem likely lies elsewhere in the fill valve assembly or with the flapper valve at the bottom of the tank. The flapper might not be sealing properly, or the fill valve itself could be faulty and require replacement. Consider checking the flapper for wear or obstruction next.

Transcript
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So really, you don't even need any tools for this, but I'll just quickly kind of tell you all the anatomy of the toilet. So you just get a general idea. First of all, you have your water supply line that runs into your tank up through what this is called the fill valve and then this part down there, that's the flapper and this is how the water escapes. You know, when you push the handle, the flapper lifts up the water exits and the tank fills. And the tank knows to stop filling when this float right here is raised by the water to a certain point. So how do you ensure that the water is filled to the point at what you'd like? Well, all you have to do is adjust this screw right here. And if you want the water to go lower, you turn the screw clockwise and if you want the water to go up more, you turn it counterclockwise.

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