Just as an update on this saw, so far the green Tygon fuel line that I installed on impulse nipple on the rear of the engine block (no clamp) has been holding up just fine. I imagine as it ages it will eventually deteriorate at a much sooner rate that the Echo 3mmx 6mm stuff you are using. Also, I went ahead and replaced the muffler cover as it was pretty bloomed out with rust. I noticed the piston and cylinder was in pretty decent condition so much life left in the saw. I remember looking at the parts lists for this model (Forester 3300) and they seem to indicate in the illustration portrays that the piston has two rings, but mine only had a single thicker ring. My saw has 94 in the beginning of the serial number, so 1994 manufacture I presume. I don't have the porous filter at the end of the line that hangs free in the air filter compartment so I just stuck a short piece of an aerosol squirter straw from a carb cleaner can on the end and have been running it that way for now. I think it is a sintered bronze nipple breather filter that is supposed to go there. It came to me missing that though.