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Sounds like lift pump, those years 98.5 to 2002 or so had the electric lift pump that would get weak and not supply enough fuel pressure. That ends up taking out the injector pump also since that fuel cools the injector pump. Swap out the lift pump in the tank and cross your fingers!
-J
On those years the lift pump should not be in the tank unless someone had put a conversion pump in it.
From 99-02 a Carter lift pump was added to the 24-valve trucks under the hood, next to the injection pump. Unfortunately, diaphragm pumps are designed to push fuel, not pull it from the tank, and it is not uncommon for the Carter pumps to fail-even in stock applications. When the common-rail engine was introduced for 2003, the lift pump was moved to the fuel tank.
Read more: http://www.dieselpowermag.com/tech/dodge/1007dp_cummins_lift_pump_upgrade/viewall.html#ixzz2KT9WoaE1
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