The image below comes from the FSM for the OM617.952. All I can say is that the line is plastic and if you break it while the engine is running, it will pump your oil onto the ground PDQ!

I hold out hope that the IP is still good. That's why I was wondering if the lift pump might be starving the IP. These are some of the things that I do not know. The list is not short.

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83 300TD, 260,000 miles, aka "Dusty"
6 vehicles, 2 cup holders (both in the dump truck)