I been meaning to share this for a while, but just now have the chance.
Last winter we drove my '83 300D from Vermont to North Carolina. No problems, it was a great ride. However, on the way home, we got stuck in the middle of The Fort McHenry tunnel on I95. The car just died, and I have to say that being trapped there with my family was one of the most terrifying experiences of my life.
Long story short, some kind soul called the tunnel authority on their cell phone and we were quickly rescued by the State Police and a tow truck.
When we got out of the tunnel I checked the primary filter -no fuel! That was weird considering that my fuel gauge was at 1/2. I tried to put fuel in the tank, but it would only take 0.8 gal.
After a little more checking, I realized that my fuel tank had imploded like a crushed beer can reducing its capacity and jamming the fuel sender at the 1/2 mark.
Culprit was the tank vent, which for some reason is located under the car just ahead on the drivers side right rear wheel. It was completely jammed with dirt and I imagine vacuum created by sucking fuel from the tank was what caused the implosion.
Please do yourself a favor and check/clean your vent before it's too late. At the least you could save yourself an expensive repair.

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Pure Vermont Maple Syrup
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1982 300D Turbo
1983 300D Turbo