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Vacuum lines on distributor?
Trouble with my W108 1970 280S. Zenith secondaries are not getting fuel (INAT 35/40). Trying to determine if I have a vacuum leak. There are 2 lines running to the distributor vacuum diaphragm (one to either side). The one on the front side appears to operate the advance mechanism. What function does the second vac line (red in pic) serve? Car has 34K original miles.
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