Originally Posted by jfoj

Get out of your chair, go out and pull the hose from the port on the intake boot. Use for finger or a vacuum gauge and tell me how much "vacuum" is present at this connection, there will be none. You could also hook up your fuel pressure gauge and see there is not change in fuel pressure when the hose is removed.

And why you all want to argue, MOST other vehicles with vacuum operated Fuel Pressure Regulators have Manifold vacuum and went the "vacuum" hose is removed from the fuel pressure regulator the fuel pressure increases. This is not how the M54 is configured and you do not even believe what the BMW documentation states.

So until you bother to do you homework you are just wasting your time and other peoples. But this is what you apparently like to do with your time from what I can see.

OP, sorry your thread has turned into a crapfest, I am at least trying to help you and providing you with accurate information.