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Hi my name is ***** ***** i have been in the plumbing field for 20 years. I will be glad to help you today. There must be a restriction in the diaphragm of the fill valve. Turn the water off and remove the head of the fill valve. To remove the head you would remove the cap then turn the part with the float arm attached. Take a cup and turn it upside down over the head and turn the water on to flush it for a couple of seconds then replace the parts. That should remove the restriction and get it going again.
It is a bit difficult to remove. It really just kind of snaps on there so pry it off. Work one side then the other and it will come off.
That is the diaphragm that turns it on and off when the float comes up. So that was the easiest fix. Since that did not work then you will want to disconnect the supply line. Turn the water off and disconnect the supply line from the bottom of the tank. There is a screen there that may be causing the blockage. Also direct the supply line into a large bowl and turn the valve on and be sure it is not the water valve itself. Did the problem start after turning the valve off and then on again or did the problem start just randomly?
If you want to save a bit of grief you could just replace the fill valve. It is only slightly more difficult than finding the restriction and they are only about $8. There is a screen there but it could have been taken out when it was installed. The water should have passed through when you removed the cap etc. When you removed the cap on the fill valve did you also remove the head part also or just the plastic cap part?
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