Do you any engine warnings on the DIP panel ■■?
Electrically wise ,are the batteries fully charged ? I can’t remember the exact voltage but if the drop below say 20volts when cranking the engine ecu will shut down as all the power goes to the starter
Does it have a mega fuse behind the battery box ? ,they are prone to rotting away
You say you had all the bulkhead plugs disconnected ,you have pushed them all in correctly ■■ Also the pins do suffer from corrosion which can cause issues
Does you Delphi read fuel pressure when starting
It should still start with the crank sensor down and it should give a warning on the DIP
Are you getting all your feeds and earths at the ECU■■?
Lastly is the small earth ■■■■■■■■ the ECU OK ■■?
It may well indeed be your VIC issue which is a Pending /Active fault ■■
Fuel wise things to check
Remove the feed pipe to the common rail and get someone to spin the engine over see if you are getting fuel.if not then strip the pre-filter head and check for debri ,you no doubt have a metal tank and they corrode internally very badly and choke the filter …
If you do have fuel at the common rail feed pipe ,remove the pipe from the prv on the rail and see if that is ok …ie no fuel should come out the rail…Then remove the leak of pipe from the rear of the head and spin it over there should be little to no fuel coming out
You can also unplug the main fuel pump,though it will activate a red warning ,it will default the pump to max fuel pressure