The toilet fills and the float works but after the water level reaches 1” below overflow tube the float is all the way up but the water still drips very slowly into the tank.. In about 30 minutes water covers covers the top of the overflow tube and drips down the tube continually. This toilet has a donut shaped float around the fill valve that rises and stops incoming water except for the drip.
Flapper works well with no leaking around it.
I’ve adjusted the adjustment screw so the main flow of water is stopped about 1 inch below top of overflow tube. No mater how much I turn the screw water still drips until it is dripping over the tube.
How do I stop the water from dripping and then eventually going over the top of the overflow tube?
Water – Toilet fill value hissing and dripping after it reaches the stopping level.
toiletwater
Related Solutions
The most common problem that causes the symptoms you describe is a slow leak around the flapper. A very small amount of water drains into the bowl over time, lowers the tank level a slight amount and activates the float valve of a couple of seconds to refill the tank. What you should do before getting carried away dissecting the fill valve, is to check the flapper, clean it and it's seat well and be sure it is centered on the drain. If there are any signs of wear or cracks around the edges, replace it. Monitor the tank level between phantom fills, does it change at all? The second thing is to slightly lower the float so the water fills to apx 1/2 inch below the fill mark. This will eliminate the possibility that you may be losing water over the overflow, and tripping the fill valve.
These checks are simple, cheap and often solve a very common problem. Good Luck.
I think @Tester101 has asked the pertinent question: Is the fill valve height adjustable? It is. You need to adjust its height:
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Best Answer
The toilet fill valve inside the unit is failing. Now, what to do?
If by chance I had the packaging or documentation from the last time I replaced it, or there's a make/model visible on the valve assembly, I'd see if I could find a replacement washer set. Some fill valves are easily repairable (if you can find the correct replacements). Many aren't, so I wouldn't spend time worrying if this isn't true.
If I didn't have that and it seemed to be a "standard" toilet, I'd check at the home improvement store for a replacement fill valve assembly. In most toilets, replacement isn't very difficult. Drain the tank, unscrew the line from the tank, unscrew the nut holding the valve in place, and replace. The only tricky part is that there's no completely standard assembly. While most standard toilets will be easy to replace, there are some odd bits out there. But this tends to be a pretty inexpensive part for a DIY repair (probably around $20). Just keep all the old parts around in case you get to the end of the assembly and find the new part doesn't fit for some reason.
If you have a custom toilet (very low profile, odd tank shape, etc.), I'd take several good photos of the assembly and go to a plumbing supply house. Ask them if they can identify the unit and suggest a replacement.