I removed a part from my 1993 300D that was leaking fuel all of the sudden. I am burning WVO in this car, and after removing this part and inpecting it there is a rubbur gasket that i might need to replace. But i do not know what the name of the part or the gasket is. I do have the part number for the metal and plastic part.

It uses engine coolant to Pre-Warm the fuel.
'Problem is the O-Ring replace it. (the Buna rubber should work for a while)

See if JA Davis @ fryerpower.com has a Viton replacement.

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'84 300SD sold
124.128