A bit of the background: I have a Mercedes that has a serpentine belt-driven air pump to help reduce smog in the exhaust. I heard this whole pump can be removed without causing any trouble, so I decided to go ahead to reduce repair problems.
Then I realised there is a shutoff valve connected between pump and exhaust manifold. And this valve seems vacuum-actuated as there is a thin clear line that goes into it, which I assume is a vacuum line.
If I removed this air pump and shut off valve, the vacuum line would be open, which I think may cause vacuum leak. Are there any ways to address this vacuum line issue? Thanks.