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the pressure regulator on ke jet is regulated by a small line from the fuel distributor.i believe that line is not vac as such but a depression line from the crankcase vapor line at the rear of pass side valve cover.i think it is more of a safety conn in case the diaphram ever breaks in the regulator.i might add that i have never seen one break which doesn't mean it will never happen as we drive older and older cars.
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