Ok so I drained the diesel tank with a minimal mess and remove the large nut. However, when I got it off THERE WAS NO SCREEN ON IT! I either took off another plug on the tank with a hose on it or I am for some reason missing my screen. Below is the pictures. Has anyone seen this before? Am I an idiot who can't tell his plugs apart?

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'78 300D 85,000 original miles drive her daily

Maybe it broke inside the tank. It is the only large nut on the tank, but your pics are fuzzy.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

Here is a better picture of the screen. It doesn't appear to be broken. I definitely did not expect this.

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'78 300D 85,000 original miles drive her daily

Compare it to the factory unit:



I'll bet you can find the place where the screen corroded away.

Thank you for the link I did find the spot. There was a piece left but was very tightly connected.

So I obviously need a tank screen. My tank also was black and slimy inside. I beleive this is an idication of algae am I correct? I do know my car sat in storage for a year or two before I got it. Maybe it developed then.

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'78 300D 85,000 original miles drive her daily

fungus not algae, algae needs sunlight to survive and grow.

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1982 300D Turbo 203K silver
Need to fix these leaks badly