to me that sounds like the line that's supposed to go to your fuel pump to make it work. You should have 3 lines going to your carbs, then one line comming from the block to the fuel pump, without that line connected the fuel pump won't work.
I just went out and looked at mine. I don't have any hoses going to the engine down under the left carb on the clutch side. I only have the oil line that goes to the intake on the engine side of the carb, the fuel line to the carb, and the larger fuel bowl drain tube on the bottom of the carb with the plug in it. Is it possible that the hose you're looking is a piece of an old hose that was replaced?
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