I'm in the process at this very moment of checking to see how the plungers in the injection pump correlate to the 15 degrees ATDC and the engine's cylinder intake stroke. I'm trying to fully understand the illustration that H202 posted. I will test for the air in the system when I get back to that point. According to initial Mercedes Benz design or Bosch's design, this pump is supposed to bleed itself of air. And I know that once I get everything back RIGHT, the engine will start and bleed itself of air and I won't have to run a battery down in the process. I'm discharging batteries because there is a problem, somewhere in the fuel system. When I get it right, it will start right up like it is supposed to.

BenzDiesel