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The line that appears to be a vacuum line to the pressure reg valve, is not a vacuum line. it is a vent line. As the diaphram moves back and forth in the reg the area behind it must vent. To keep from pulling dirt and/or moisture the line is run to the area of the air filter.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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