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You don’t know very much about diesels but you’re inclined to believe having the wrong pump is ok? alrighty than…. Its not totally uncommon to see the wrong application pump in a hmmwv and it runs…my observation is that of a technical one, my shop would never install that pump on that engine…

correct, 6278 is just a newer pump model, it replaced the 5209… as far as “what does it mean”? It means you have the wrong pump per the application chart/TM for that motor…what I’ve generally found on the 4879 pump is when used in a 6.2 before 1990 1/2 model engine, is the timing has to be...

wrong pump for a 6.5 detuned…that motor should have a 5209

that pump is for a 1990 1/2 6.2L Engine…

may simply be normal, but retarded pump timing, clogged catalytic converter, failing turbo charger…all produce black exhaust. question is, just how bad is it? These older IDI motors will produce black smoke faintly under load and snapping accelerator. these aren’t like modern diesel’s of today...