Ok, so I've been working on diesel leaks on my OM606.910 NA diesel.

When I remove the intake manifold, underneath there was a hose loose. Please see pictures below - it's the one going up in the first picture, or coming out of connection #6 in second picture. Where should it go? What's it for?

Thanks a ton in advance!

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1985 W460 300GD OM617.912 w/ STT turbo (ongoing OM606 engine swap)
2011 W212 E220 CDI