I was gifted an SP40 by Ron Woods a couple weeks back (thank you Ron).He seems to think that I have more patience than he has (yeah right,don't you read my posts Ron?Lol).I haven't been able to do a heck of a lot due to knuckle replacement surgery,but today I tore into the old gal.This saw is fairly easy to work on,unlike the mini macs.Ron told me that the fuel tank had a leak.I just had a gut feeling that it was the fuel line & not the tank.Of course I haven't tested the tank yet to prove my theory.I did however find a kink in the "aftermarket" fuel line (Tygon I believe) right up close to the barb on the fuel tank.It could be a combination bad fuel line & leaky fuel tank.In any case,rather than replace the line with an OEM line,I'm wondering if it'd be alright to just replace the damaged Tygon line?I think the reason why the Tygon line kinked was because it's not stiff enough.I have a section of line that's stiffer than Tygon.