Modern Vespa

^This (choosing fuel resistant plastic materials). Ditto on hoses and seals.

Try Ebay for MP3 parts. I bought injector, pump, tank and filter (which I did not need ). The real problem was the injector loads relay had gone hi resistance at 10k miles. One relay powers pump, spark coils, injector and probably storm doors if it has any. A 30 amp relay that runs always. If the key is turned on, its on: cleverly hidden under the plastic cover on front.