Could it be that you have accidentally gotten an oil cap instead of a fuel cap? I remember reading something about that here -- the caps will interchange but not work correctly. The oil caps are usually labeled "OEL" and the fuel caps are unlabeled.
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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
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