Turbo question (Updated) (FIXED) :>)
Rig is '98,5.9 ISB, 275 HP. Yesterday while in some hills when I would accelerate on the hills turbo boost guage would barely move. On flatlands it would operate normal (22 on guage). My thinking ...
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On many Cummins there is a check valve in the return fuel line on the injection pump. It's purpose is to build enough pressure so the injection pump has enough fuel to make max power. I'd start by replacing it as many injection pumps have been replaced when this was the real problem. Like this.
