Check the fuel lift pump, should be on the framerail under the driver's door. They like to fail on the old 6.5s. They can sometimes start with failed lift pumps if you crank on them enough and this puts a lot of stress on the injection pump. That sucker is a few thousand now, so you should check the lift pump as a preventative maintenance item anyway.
Something else to consider is the FSD, the little controller for the injection pump. They had a horrible failure rate, especially if left mounted on the side of the injection pump as stock. Most engines have been fitted with remotely mounted FSDs on a heat sink.
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