The 124 diesels have two drain points in the bottom of the fuel tank. At one point, closer to the right (passenger) side, is a single connection for the fuel feed to the engine. There is a rubber dirt cover over the 46mm nut that must be released to remove the screen. At the second point, closer to the left (driver) side, is a similar drain point with two connections. One is the fuel return line from the engine, the other is a vent. It also has a rubber dirt boot. This second one is the one babymog saw in his shop.

Jeremy

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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