Wow, 40 mpg. I wish my car could get that kind of diesel mileage. I think your car does have a elctric fuel pump, the hand pump sits on top of it. Maybe if this pump is going bad, your injection pump is not getting the fuel it needs?

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold