These three lines that you're referring to, are they the lines that go to the injection block? There is a bleeder screw at the injection block that will need to be relieved to get fuel up to that point. If you've done all that then my next guess is trash in the line or perhaps clogged injectors.then I bled all three lines until fuel came out but still won't work.
Are you absolutely certain your fuel is clean?
I'm also assuming the air filters are clean and breathing.