The other one is for the primer return line from the carburetor

thanks for reply, the only hose barb on carb is for the fuel line supply, I do not see a primer on this saw but yes I agree that would make sense why there are 2 holes in the tank. I'll look at the saw closer for primer button/etc. when I get home later today. thanks Ray

took me awhile to get back to you all, hard drive craped out. OK , I got to this unit and I still don't see where this other hole from the gas tank would hook up to . there is no primer button on this unit that i can see. I have worked on some other saws and never ran into this before. Is it possable there was a plug or something in the other hole ? any more help ? thanks Ray

The second hole is for the vent line to the tank. There should be a duckbill and connector in the tank on the end of this line.

Okay what is a duckbill ? is it that little plastic peice with barbs on both ends (apx 1/2" to 3/4" long) & where does the vent side go thats on the outside of the tank ? Ray

The duckbill is a rubber check valve that allows air in the tank but does not let fuel out. The barbed piece is a connector..insert the line through the tank, put the barbed fitting in it, put the duckbill on the end of the barbed connector- pull the line so that the connector comes to the top of the tank. The line outside the tank should be about 6" long and just lays on top of the tank.

I have the same problem - if it alowes air into the tank how's does that work ? I put a new duckbill on the hose but it looks to be a solid piece to where no air can not get through it and if it alowes air into the tank why does it need that duckbill on the line - can I just put the fuel line in it so air will get into the tank ? Because of now nothing is working and I have tried everything. Please help