It's probably the line considering the age of the saw. It was hard to pinpoint the leak on my 017, but I knew that that was the only logical problem given the age of the saw and that it had about 2 hours use on it when I got a hold of it. If my memory serves, it comes out of the oil tank almost directly under the handlebar. Can't remember if I had to take of the handle assembly the second time to replace it with an OEM after the aftermarket was leaking again. Probably did, but I think I figured out how to do it without taking it apart any more beyond the handlebar.