Chainsaw Repair

You are probabley better off to use the OEM style line in the tank  .I presume the line with the plug is the tank vent line .That brass contraption acts kind of like a check valves so all the gas doesn't gush out all over the place .

That model lists two carbs .WT 29 Walbro or C1 S S1 Zama .Tutorials on rebuilding can be found on each respective web site of the manufacture .

I have one 011 in the shed I've never used .Got it running ,made a few cuts and there it sits .

There probabley isn't anything wrong with it other than the fact I've got better saws for the intended type of work these things were made for .