There is NO vacuum to the 325/330 FPR that is integrated into the fuel filter. The F connector has NO intake vacuum present.
The F connector is nothing more than FILTERED ATMOSPHERIC AIR source. It is a clean air source.
As for the FPR this just provides an uninhibited Atmospheric Air Pressure reference source. It is connected to the F connector so dirt, moisture, water, bugs do not get into the FPR reference and plug the port.
BMW SHOULD HAVE made the 2 hoses that connect to the F connector connect into the air filter box IN FRONT of the MAF and it would have NO effect on the engine drivability or Fuel Trims.
So I went to the dealership and bought "11727545323" and it seems like the line is smaller than the fuel line hoses. I haven't gone under the car yet to verify, but it seems like "11727545323" is made for the Fuel Pressure Regular (FPR) L-shape breather plug. What is the correct type and size for the fuel line hoses? Looking at the diagram below, I don't think #5 is the same as those two fuel line hoses.
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