Here are some pictures of the 1985 300D-T that I once owned. In the second picture, the primary fuel filter cannot quite be seen as it is under the cigar hose, sorry. The red arrow in the last picture points to the Vacuum Control Valve (VCV) for the transmission. Caveat: the EGR system and trap catalyst were removed from this car for testing.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970