Why is my toilet running?

Hey guys thanks for reading

My toilet is running. slowly but constantly after the bowl fills up. I have jumped onto youtube and watched sevral videos stating it should be an easy fix etc but as per the photo mine seems to look nothing like hat i have seen online... any ideas?

 

You have a dual flush toilet. Light flush for one of the 1/2 moon colored areas, full flush for the other (or both). The fill valve (black tower to the left) looks pretty standard.

First you need to determine if the fill valve is not closing, or if the flush valve is leaking.

Turn the water off at the wall shutoff valve and see if the level in the tank drops. If so, that's a flush valve problem. You may need to replace or rebuild it with new gaskets and seals, or just replace it (more work).

If it continues to run after the toilet is flushed and goes into the overflow (the open area below the top of the flush valve), then you have a fill valve problem.

You are also missing a small tube that should go from a nipple on the fill valve to the small hole in that stepped portion of the flush valve.

Find the name of the manufacturer in the tank or on the bowl.

 

Throw some blue or green food dye in the tank. Does leak into the bowl?

 

If you lift up on the black fill valve arm does the water stop filling or does it continue to run?