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The witness marks will verify pump timing is correct only when the engine is cranking, or at low idle speed. And even that isn't true all the time, since slight wear in gear train, timing chain, and pump insides can require you to not use those marks. The theory is - if a pump is known to be...

Injection pump from a 6.5 is too big for a 6.2. Turning down the fuel delivery will not make a 6.5 pump with .31" pump-plungers, behave like the correct 6.2 pump with .29" pump plungers.

Pump timing marks don't mean much Are you sure you got the right injection pump? Sounds like you might have one too big. A 6.2 uses a .29" pump and a 6.5 uses a .31"pump. What is the ID number on your's? For example, this is a 6.2 pump - DB2829-4879 10149634 1990½ HMMWV (Military) - 1.2...