Vacuum lines😡

[Shockwave103]

I am in the midst of a s52 swap I pulled my s52 out of my 98 M3 last weekend and I found a blue vacuum line that was connected to a plug coming off the bottom of the intake manifold right in the middle and the line runs all the way to the back of the car next to the fuel lines and up to the gas tank What is this thing and do I need to take it off and put it on the e30?

[Klug]

Vent line- Don't need to use it.

on the M50 manifold for the s52 in the e30- The vac line on the bottom of the manifold goes to the running looses module, line in the center of the manifold goes to the FPR and the rest is all CCV BS