The Baseball Stars

My saw is several years old and this spring when I fired it up it did so with ease as usual. When I laid it over on the side to drop an old hickory that was threatening my dad's back porch, fuel came running out from inside the casing like crazy. I thought the fuel line may have been cracked but upon further inspection I found the source was a small vent tube on the top left side of the fuel tank. I know the tank must be vented but there was no sign of a tube up to the intake or a one way valve or anything. I did see a place in the housing that appeared to be shaped to accept a small tube. I partially disassembled the saw but found now answers. An online search could not turn up an exploded diagram or maintenance manual. If you have some knowledge of this issue, any assistance appreciated.