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Test the Flush and Confirm Repair — Replace Tank Lid

Beginner30 mins

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

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After adjusting the float, test the repair by flushing the toilet. Observe the tank as it refills with water. The fill valve should now stop the flow of water at the new, lower level, well below the opening of the overflow tube. Confirm that the toilet flushes only once and refills properly without initiating a second flush. Once confirmed, the repair is complete and you can replace the tank lid.

Goal: Toilet Repair (Standard)

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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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we're squeezing the adjustable fill level. We can test the sound of it, make sure it flushes the same level of water. And we should use that. So that fill level can adjust the range of our flush. So it looks like we've got a good flush power there. And now it's not going to do the double flush. And that's how you fix the double flush problem. And now we're not going to do the wasting so much water. There's only a flush once. But sometimes you may think you need a flush once. Anyway, that's perfect. That's what we want to do. A flush once. And then shut off. That's a shit. Good to go.

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