Incredible to imagine the work that went into resolving problems that didn't exist (fuel system work, etc)-- such a lesson in the value, and difficulty, of root-cause analysis in such complex mechanical systems. And a lesson why doing something off-the-track (like modifying the fuel system like I think was done here) is not a good practice since it flies in the face of resolving fundamental from-the-factory operation. Returning to fundamentals seems key in problems like this (from the distance my rookie mechanical mind can see and has experienced in much smaller increments vis-a-vis cars, very much the case though with complex computing systems in my experience by analogy).