Just gone back and read your post again, I was going to delete the following as its just a ramble, as I completely misunderstood your post, but I'll leave it anyhow for anyone thats interested.
Not really sure what you are asking, do you have an existing engine that will not start, or have you uncovered an old engine and are wondering how to get it going.
To remove air from the system you can loosen any 2 of the injector pipes, turn the engine over and then when any bubbles stop and clean fuel comes out, tighten the unions whilst the engine is still turning over, before you do this you need to fill up the fuel filter and bleed the pre transfer section of the pump, you need to look at the book, I dont know how you do this on the vw, that said its probably just a bleed screw but you do need to know which one it is.
A good test for air is feel the steel injector lines by hand whislt cranking the engine, if theres any air in them you wont feel anything, if there isnt you'll feel a positve whap each time the pump sequences that injector.
There will be a pump alignment mark somewhere on the pump or sometimes theres a bracket with a mark on it, if someones been fiddling its probably miles out, you'll need a special gadget to re-set the timing, you can sometimes reset the timing using the 'gooseneck' method, but thats not recommended.
hope this helps.