I have a small trickle into a toilet bowl that I'm trying to stop as it's causing rust lines and wasting water. The flapper is relatively new and I ran my finger along the edge of the valve rim to see if there was anything abnormal and it seemed smooth to me. Any other suggestions on where to look for the source of the problem?
Update: I've replaced the fill valve and the trickle is still there. Going to replace the flapper and scrub the flush valve rim with fine steel wool before assuming the flush valve needs to be replaced.
Update: That seems to have fixed it.
Best Answer
A leaking valve can also cause this kind of leakage rust, scale & small gravel can also cause the valve to leak. Some valves can be easily disassembled with the water off. A cup or glass put over the top and the valve turned on to flush the debris out. Reassemble with the water off and see if this helps. The float adjustment would be a quicker check as @jack suggested+. a video on how to flush a kohler fill valve. this is really quick and just 1 of several ways to clear the debris out. Some also have 4 screws on the top those you need to take apart and flush with the cup. some have tabs that when pressed in release the cap. Not all valves can be cleaned and some like fluid master can be pulled off the stem and a new valve installed in seconds. I hope this additional information helps.