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It could be just a overflow hose. For fuel spills during fill-ups or for the carb if it falls over. I dont think it has any importance to the problem your having. Where does the hose end? Vacuum hose for fuel flow? I dont think it would even start. Is the fuel tank below the carb or above it? I have no idea what model you have, plus the only Piaggio I know is my Liberty 150 and it has EFI. Im wondering if you could be getting vapor lock. Next time the scooter dies out, quickly loosen the gas cap and see if it 1: Makes a hiss noise. and 2: Starts right back up after the cap has been opened. I had a old car that did vapor lock at random. Annoying and embarrassing. I just drilled a tiny hole in the top of the fuel cap. You could also do a plug chop when it dies and see if its lean. White colored end is a lean sign, it should be coffee colored. I dont think thats the issue though.
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