Please help me identify this rubber hose.
After removing the encapsulation cover under my 1994 Mercedes c220's engine block, I saw that leaked engine oil has damaged a rubber hose (diameter ~ 1 inch and length ~ 5 inches) that connects an aluminum tube coming from the starter to another long straight aluminum tube going up to some vacuum assembly located near the top oil dipstick tube. I would like to replace this rubber hose but could not figure out its purpose and part number.
Could someone please help me identify this rubber hose and possible its part number?
Thank you very much in advance.