Here's the owner's manual for that saw, and I see the vent in the parts list, but I can't tell where it goes in the saw (it's in the lower left of the diagram on that page in a "box", apart from the saw.)
Craftsman 358.351202
Scott in Penfield NY
That style tank vent comes through the top of the tank right beside the fuel line.
But that doesn't necessarily mean you have that tank.
As has been said before, if the tank has ever been replaced, it could have been replaced with the superceded tank.
There are only two that I know of, the brass plug in the side and the top style.
If you don't have two lines coming out of the fuel tank, you have the one with the brass plug in the side. (or possibly one that has been re-engineered)
Mike