Ok well start with the basics.
YOu say the tank is half full, are you sure it's full? With volvo fuel gauges being as bad as they are, have you manually check the tank?
If it has fuel next step would be to loosen the fuel pipes on the injectors and crank it, see if fuel leaks out of each.
If that's ok, retighten the unions.
Is the pump timed correctly? Is the Belt slack? it may well have jumped a few teeth putting the timing out.
If the fuel filter was only half full then it may simply be an air lock, take the filter off and fill it with Diesel, also if you've blown the lines though they'll now be empty and you may need a lot of cranking to bleed the system through.
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