Toilet Bowl Overfilling

Does anyone know how to fix this? There is a fill line, but about 50% of the time the water ontinues until it overflows. I can stop it by manually pulling up the rod with the black float. Does it need new parts or just an adjustment?
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First of all, where's the short rubber or plastic tube from the valve body to the overflow drain tube?
Second, the screw on the valve end of the float lever is probably the adjustment; turn it IN a 1/4 turn and see if that solves the problem.
Otherwise, the "seal" or washer inside the inlet valve ought to be replaced. $2 +/- at local hardware. Turn the water OFF. Remove the little locking tang from valve body, twist the top of the valve OFF. The rubber seal is before you.
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It has never had the rubber tube and there has been no problem until recently. No water ever runs out of that opening when the toilet is flushed, so I don't see what adding a tube to the spout would do.
There is a fill-line marked about an inch or two below the top of the overflow tube and the problem is that the tank continues to fill past that mark even when it stops automatcally. Most of the time the tank will stop filling just as the water starts spilling into the overflow tube (but even that allows more water than needed to fill the tank) and other times the float doesn't ever kick up far enough the to stop the water and I have to lift it by hand. The stopper is not leaking.
Which adjustment causes the float to rise higher up at a lower water level so it doesn't keep filling past the fill line?
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Rex wrote:

The screw at the top of the valve controls how high the float rises to shut the valve. Bending the brass rod (float arm) down should also make the valve close sooner. However, it looks to me like the the float arm contacts the center tube so you cannot make the float drop correctly and then turn off at the correct point. Also the float may rub on the back wall of the tank. Someone has replaced parts (or it was made that way) so that the parts don't fit correctly. The float arm needs to be moved toward the front of the tank to miss the center tube and the float should be over in the center of the tank (front-to-back). You might be able to accomplish that by turning the fill mechanism assembly, but that means turning the water off, draining the tank, loosening the fill mechanism, twisting it, tightening, and checking for leaks when you refill the tank.
Or you could just replace the mechanism with one of those where the float is part of the fill fill valve mechanism.
If it were mine, I would first try turning the fill mechanism so that the float is free and misses the center tube. If that didn't work, I would probably just buy a bit longer arm and bend it so that it fit correctly. That means you need to bend it laterally so it misses the center tube and possibly bending it down as needed at the float end.
Looking down: ---------- \\ \\-----------Float
Looking sideways:
-----------------------\\ \\Float                             After marking the rod, you need to unscrew it so that you don't mess up the float or the valve while you are bending the rod. Then screw it back in when you finish bending it.    
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I bent the float arm downward and now it shuts off near the marked fill line. The arm must have been bent down when it was first installed and straightened itself out over 2 years.
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Just bend the rod to lower the float a little.
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http://www.fluidmaster.com / is their interactive website for this. you can simply replace the fill valve and throw the old float fill valve away.
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Rex wrote:

My comment does not relate directly to your problem, which I bet has been addressed by the other posters, but it also appears, from your clear photos, that you are missing the little tube which attaches to the valve body and should be clipped to squirt into the overflow tube. The water that squirts there helps the bowl fill up quickly and properly. -=Art=-
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You are missing a hose that goes from the blue fill tube to the white pipe.
I would turn the black/blue assembly clockwise so that the brass/aluminum rod with the ball on it can travel up and down smoothly without hitting the white tube. Grasp the brass rod and bend it down slightly, flush, and watch. If the water is still coming a bit too high, bend the brass rod down some more. This allows the black float to lift the arm sooner and shut off the water.
Hope this helps.
(top posted for your convenience) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Keep the whole world singing . . . . DanG (remove the sevens) snipped-for-privacy@7cox.net

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