Vacuum Question.
 

Thought id use the car wash with heated bays to check for vacuum leak lastnight. Remember someone saying the 4x4 runs off same vacuum as the windshield washer pump. Does the pump have to be running for it to have vacuum because there was nothing on mine. I notice the hose runs into the firewall but not sure where from there. I also noticed some vacuum lines needing replaced, will check another time.

Thoughts?