Thanks for the replies.
I have read about all the preventive maintenance on this model that I should perform and have started a list of parts to order such as;

All the clear fuel lines, both pre and main filters, the plastic clips that hold the metal fuel lines(some are broken) and oil filters.
I’m still looking for the part numbers for the 3 o-rings for the fuel shut off valve and the correct size rubber fuel line that comes off of the fuel filter housing to something under the intake? Also any others that you may think of. My goal is to remove intake manifold and replace/repair anything fuel related at that time.

The previous owner replaced the water pump, turbo, glow plugs, alternator belt tensioner, belt and A/C compressor. All done within a couples of years.
Thanks

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1998 E300 Turbo Diesel, 221k Miles
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2007 Honda CRV, 115k Miles
2011 Kawasaki Trans Mule, 212 hrs, (grandkid hauler)