clogged fuel lines?

hi,

i just swapped out my 2.3 for a 5.0. In doing so I replaced the fuel lines, and while installing them in the back I got some dirt caked on the differential in one of the lines. I'm not getting any fuel up front, and I was wondering if this could be the reason?

I think the lines are connected correctly - in the front there's only one way to hook them up according to size & in the rear I made sure to mark off which line ran to which...

Any suggestions? I'm getting absolutely NO fuel... the release valve give me the sound of air in the front and when I disconnect the lines, they're bone dry.

I've put in a month of work to swap out this engine and I want this thing to run!! =P

Any help is greatly appreciated,
thanks,
johnny