OK I'll bite on this one
The Vacuum pump pulls air from the vacuum lines to create the vacuum.DUH!
Sorry I couldn't resist. Jeff
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1971 R600 Mack toterhome (SuperDawg) 
99 NU-WA Snowbird 34+2 SE 102 5er 
If it's not diesel, it's not in my stable!
53 F100 617.951/auto 
95 Dodge 3500 Cummins/5 speed service truck
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