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The other hole should be a vent hole.
J.R. This does not solve the problem. If this a vent hole it should have a tube going somewhere. As it is, the saw will not continue running after it is started and gas just pours out of this hole and if it did continue running, you would not be able to turn the saw on its side without gas running out.
There should be a line that comes up out of it or it should have the little plastic breather vent that plugs the hole. Did it leak fuel prior to this?
See attached link. Read the description. 2 hoses,filter, and vent.
I have looked everywhere and as near as I can tell it is only sold with the tank. I am still looking.
Here you go.