Don't assume anything as you'll make an ass out of you and me!
Make sure they are on right to begin with as this is an easy fix.
If you have no blockage in the lines then either the fuel pump is knackered or there is an issue with the auxillery shaft maybe.
Did you try removing the fuel hose fro the carbie end and cranking the engine?
Could be your carbie is not set up properly too.
Cheers
Matt