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Turn off the water at the shutoff valve, flush the toilet and hold down the handle. There may be a little water left in the bottom of the tank, but don't worry about it. Wipe the flapper seat with a clean cloth to make sure it's free of debris, and check it for cracks or splits (Image 1).
if toilet is running non-stop, check flap in tank. possible handle not returning completely holding flapper fron seating tightly. if toilet runs, then shuts off for awhile then runs again, flapper needs replaced.
Toilet runs continuously or doesn't flush adequately
Jiggling the handle might work for a while, but if your toilet is always running or doesn't flush adequately, you need to perform these simple fixes that usually can tame a noisy, inefficient toilet.
Check the Chain The chain attached to the rubber flapper often becomes loose, causing incomplete flushing and/or continuous running. To fix it, remove links from the chain using needle-nosed pliers until it's tight.
Check Water Level
Improper water levels can also cause problems with your toilet. This can be fixed by adjusting the ball ****, which is located next to the overflow pipe, the open tube to the right of the handle. Adjust the ball **** so the water comes to ½ " below the overflow pipe.
Clean the Surface of the Flush Valve
A continuously running toilet can also be the result of a faulty flush valve. Because the valve is made of rubber, it can decompose or warp allowing water to escape from the tank into the bowl. Clean the sealing surface to see if this will improve the seal. If too decomposed or warped the valve may need to be replaced.
Replace the Flapper Remove old flapper and replace with a suitable replacement. Attach the flapper to the overflow pipe inside the bowl. Then attach the lever chain from the flapper to the handle lever making sure the chain is taut.
This video will help familairaize you with the flushing mechanism and the repair:
It sounds like it is running constantly because of the leak. Where is the leak, at the bottom, around the plastic nuts underneath or is there a crack in the tank? Let me know.
Fix the leak and will have fixed the running problem
Either the Fluid-master valve is going bad or your flapper needs to be replaced. Both are an easy fix. To check the flapper run your fingers along the underside of it, if the rubber comes off on your fingers its bad. Otherwise you'll have to try replacing your Fluid-master valve.
How old is the toilet? Might have lime buildup in the housing that's keeping the float from raising completely. The whole assembly is relatively inexpensive at Wal-Mart, and very easy to change. It would probably be less hassle than trying to fix the old one. I found that out after wasting a lot of time trying to mix my old one. :-)