Mercedes Benz W202 C280 Vacuum System Check

A vacuum system check on the 1995 Mercedes W202 C280.
Ive been chasing a problem with my secondary air injection pump for years, still can't find exact problem, but a friend of mine had same issue and it got corrected when he eliminated a vacuum leak, so i decided to check my car's vacuum system as well.
The issue with my air injection system still exists, it's intermittent, so i can't figure out what exactly is causing this issue. No CEL, but the air injection pump runs for 5-6 min until coolant temp hits 56-60 deg, then in about 30 sec starts again, runs for 1-2 sec. Doesn't affect engine performance when driving or anything else...
My understanding is that It is supposed to run for 90 sec at cold start.

**If the video was helpful, remember to give it a "thumbs up" and consider subscribing.**

Disclaimer:
Due to factors beyond the control of AndyP Mercedes-Benz Channel, I cannot guarantee against improper use or unauthorized modifications of this information. AndyP Mercedes-Benz Channel assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk.
AndyP Mercedes-Benz Channel recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of AndyP Mercedes-Benz Channel, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not AndyP Mercedes-Benz Channel.