Scooter Leaking fuel from the carb vent?

[joshuah459]

My scooter has been sitting for a few months and I am trying to revive it, but upont trying to start it, it, 1. wont start after sever seconds of cranking, 2 once started leaks gas everywhere and runs rough. my larges questions is where to begin with this because i swapped it with another carb i had on hand an it did the same thing. Is it purely a coincidence that they have the same issue or is something else wrong?