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