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The vacuum source for the regulator should come off the intake manifold. the intent is to maintain a constant pressure differential between the fuel and intake manifold pressure. Essentially the spring in the pressure regulator sets the base pressure (gauge pressure) and then you connect the manifold vacuum source to the regulator to the side opposite the fuel. Since the vacuum and fuel are on opposite side of the same diaphragm any change in manifold vacuum is immediately balanced by the same change in fuel pressure (force x area = pressure).
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