Ok, just to confirm that I have READ the thread......

If like you said, you bypassed the vehicle fuel system by plumbing an independent fuel line and boost pump directly to the Injector pump input and you are still getting air and no fuel coming from the injector tips, it is starting to sound like a bad injector pump......

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)