Are we sure we are speaking about an OM603 in an '87?

There is no voltage at the fuel rack on this IP. It's a mechanically driven rack..........driven by your right foot. Nothing else.

How long did you crank the engine (measured in total number of seconds) after the IP was replaced?

Are you positive that the camshaft is turning and all the valves are opening and closing? Has anybody pulled the valve cover and confirmed this?