I'm trying to fix a leaking toilet, and I can't seem to find a guide for the problem I have. Most of them are for fixing a leaky flapper or fill valve.
When I flush the toilet, the tank fills normally until it is full. I've confirmed that the float ball and valves are ok. After the tank fills up, I noticed that the filler tube (red arrow in the diagram) is bubbling and it sounds like the tank is continually being filled. If I move the float ball arm up a little bit, the leaking stops. I tried adjusting the height of the ball and tightening it, but the filler tube keeps bubbling.
Is this a problem with the float ball or fill valve?