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FDS7 - Check Vacuum Supply
^ Key Off.
^ Vacuum hose removed from the fuel pressure regulator and plugged.
^ Install a hand operated vacuum pump to the fuel pressure regulator.
^ Start engine.
^ Observe fuel pressure while applying vacuum.
^ Does fuel pressure reading change as the vacuum changes?
YES -- Service vacuum system. Remove plug from vacuum hose and reconnect to fuel pressure regulator.
NO -- Replace fuel pressure regulator.