Ok I've finally buttoned up my engine and i went to start it for the first time, it cranks over really nice but I'm getting no fuel when I look at the fuel filter in the line between the fuel pump and carb...this is my first time trying to start it since I swapped it in, this is my first time so I was wondering if and body had a list a possible reasons why this is happening so I can get this thing running, thx for help!!