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Please see the attached. Upon an engine bay inspection, I found this vacuum line just sticking out next to the dipstick. I don't believe MB just throws vacuum lines in for fun or for ppl to spend countless hours figuring out what they should connect to. Vehicle is a '91 300SL-24. Any help will be appreciated! This is the hose. What should it be connected to?
The hose connects between the fuel pressure regulator (pictured) and a source of engine vacuum. That source is the underside of the rubber tube (just inside inside the top of the oval your drew) which connects the cylinder head to the air cleaner housing.