You may be right about the fuel pump.....but, I have the same style scooter (fuel tank under my feet), and have never had a problem with getting enough fuel up to the carb.
If you're not loosing vacuum due to an old, dried out, loose fitting, or cracked hose.....I'd be more apt to think that your main jet, is one size to small. Get an assortment pack of 5 or 6 jets.....and start experimenting.
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