1992 2.6 190e

Does anyone know where the line goes to, Or is there not one on the fuel pressure regulator. My car wont start. One day it ran like it was on 4 cylinders. And the next morning would not start. It would backfire once or twice. Checked all wires good spark, Since than replaced water pump. I know the timing is probably off now, Question is: Does the fuel pressure regulator have a vacuum hose and where would it go? I bought the MB CD and can't find it. Thanks for the Help in advance.

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