Check with someone on site as I,m not a pro, but if you have any lines with air (which is compressible) from the pump to the injectors, you will not generate the pressure necessary to spray a fuel mist which will ignite in the cylinder from the heat of the compression stroke. I'm not an Oliver mechanic, but I've worked on stuff from Ford 6.9 's (IHC V-8) to Detroits and anything not direct injected has to have full lines.  You can usually loosen the fitting at the injector and while turning the motor over eject air bubbles until only fuel spews.  Do each line in turn.  Good luck and hope someone can help out.