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Locate 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

Locate the fill valve assembly, which includes the float mechanism. The presenter identifies a plastic threaded rod connected to the float. This rod is the adjustment point. Turning or moving the clip on this rod will raise or lower the float, which in turn sets the water shut-off level. He notes that this adjustment can sometimes be made with a Phillips head screwdriver.

Goal: Identify the float adjustment component

  • Some models may use a Phillips head screw for adjustment instead of a clip.

Used in this video

  • Phillips head screwdriver (Tool Type: Screwdriver) · optionalAdjusting the float level if the mechanism uses a screw.
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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 this part here that you can see right now is actually where the problem is. And it's this rod here, this plastic rod here with the screw thread on the bottom that needs to be adjusted. So it's really simple to fix. First you want to flush the toilet.

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