I guess my question was have you narrowed the original problem to fuel delivery? If that is the case, trace the known componets ie: fuel pump, relay, injectors, filter, and so on. So I understand that an engine needs 3 basic things to start: Air, fuel, and a spark. So if the problem is not starting or starting but not continuing to run, those are usually 2 seperate problems. Other solutions may be timing, or simply a poor ground at the battery or block for not starting. Hope this helps!!!
MKV Jetta 2.0T