Check the obvious things first, is the fuel pump priming when you turn on the ignition? if not have you checked all the fuses? is everything plugged in ok? (fuel pump plug connectors, injectors etc?

Also check for leaks, start from the pump and follow it up to the injectors, checking for leaks.....it may be a leaking connection at the fuel rail, fuel filter or even at the fuel pressure regulator.

I presume it isnt a immobliser problem? have u checked this?