Lots of things to check. The injection pumps until 1985 had a plastic weight-retainer ring inside the pump that falls apart. Same as many farm tractors have. It was eliminated in 1985 and all older pumps when repaired got updated. Kind of rare to find a 6.9 today that was not updated a long time ago. Pump shops used to put a metal tag on top of the pump to show it was updated. It might say "EID" on it. EID is the upgrade (Elastomer Insert Drive). Mechanical fuel pump also must be in good shape and is cheap to renew. It acts as an anti-drain-back valve. Also the Schrader-valve on the fuel-filter housing is subject to leaks. Then also what was already mentioned. New return fuel hoses and tees on top of the injectors.
Those injector pumps failed early if not upgraded. I did not think there were any left anywhere that were not updated years ago. But if it really has low miles and one owner as you say - maybe?
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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