The water is leaking out of the cap simply because the pressure pushing up on the cap is very high, and the cap cannot handle that high pressure. However, the high-pressure water should be escaping into the toilet tank and not pushing against the cap.

Why is my toilet fill valve leaking at top?

Quote from the video:
Quote from Youtube video: So one way to test this to see if this is faulty is just lift the arm. Up. And if that stops the leak then good chance that this washer inside here is bad so let's show you how to replace.

Should water come out of the top of the fill valve?





Pressure-sensitive fill valves have a small dial you turn left or right to adjust water height. The maximum water level should be about 1 inch below the top of the overflow tube.

Why is my new fill valve leaking?

Quote from the video:
Quote from Youtube video: The problem is directly related to the fill valve. Sometimes the fill valve only needs a minor adjustment to return it to proper function.

How do I fix a leaky toilet fill valve?

Quote from the video:
Quote from Youtube video: And remove the fill valve. From the old toilet tank inspect the gasket on the new fill valve it's usually in the right position. But just double-check that that's a case and then insert the 400h.

How do you tighten a toilet fill valve?

Turn an adjustment screw located on the top of the valve. To raise the water level, turn the adjustment screw clockwise; to lower the water level, turn the screw counterclockwise.

How do you adjust a fill valve?





Quote from the video:
Quote from Youtube video: Place your thumb on the side of the arm and twist the cap and the arm together. And then it's going to lift right off the top of the valve remove the refill hose.

Where does the water come out of the fill valve?

Normally, the fill valve is located on a water supply pipe coming out of the floor or wall near the bottom left side of the toilet tank, near where the water supply tube connects to the tailpiece on the fill valve.