I recently took apart an old Craftsman Chainsaw that had worked reliably for years. The plastic fuel line between the gas tank & carb just about disintegrated in my hands. Rather than just replace the fuel line I disassembled & cleaned the carb. There was a little screen inside the carb that was totally sludged up. This may have been residue from the plastic fuel line mixed with the fine grit that got past the fuel filter.
Works fine now, but I’ll be watching that fuel line.
If a fuel line is old enough it will deteriorate regardless of what you run through it. If the saw runs a little ragged while cutting you might want to open your screws a little/richen the mixture to account for the load. I forgot to do that a lot.
I sold Stihl but the Craftsman was a good saw. A Poulon?
I have a craftman riding lawnmower that got to the point it wouldn’t run. I removed the fuel line to get to the carb and I realize little fuel was coming out of the rubber line. I took it off and soon realize the inside was shredding and blocking the line.
The Carb was blocked as well until I fixed it. The lawnmower is only three years old.