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You can't crack injector lines off on the CrD (common rail), it is highly dangerous and lines have to be replaced everytime they're undone!
On Di you can bleed the lines by cracking them off but it is very messy and hard to do once everything is assembled (intercooler is in the way plus access is very tight).
Otherwise you just need to patiently crank it until it fires up (it takes a while), have spare battery handy.
Cheers