Secondary Air pump (SAP) troubleshooting and repair. Your rubber elbow has an L connector on top.Your CCV vacuum port is connected to that fuel pressure regulator.Your fuel pressure regulator is in the engine bay.If you have the M52 engine, I'd expect to see: These changes are partly the reason for all the confusion (which is noted on other threads - but which isn't fully outlined in any!).Ĭan you kindly confirm what we've said above holds water? Again, they didn't bother to fix the diagram so the diagram is confusing at best and dead wrong in many ways!.BMW changed the L connector to an F connector so that the hose that previously got suction from the CCV would now get suction from the F connector.In this case, they didn't modify the diagram at all so it's wrong in that hose #6 is actually endcap #15 (not shown on the diagram or in the parts list).The vacuum hose doesn't show any connection whatsoever! So they simply ERASED the relevant parts in the diagram (notice they even erased the location dot!).BMW moved the fuel pressure regulator from the engine bay to under where the driver sits.I suspect the following happened between the M52 & the M54: Engine => Vacuum control => Vacuum control - engine.The M54 diagram for the F-connector is dead wrong:.Engine => Cylinder Head => Crankcase-Ventilation/oil separator. The M54 realoem diagram for the CCV is wrong:.Fuel Preparation System => Fuel Supply => Fuel filter, pressure regulator.The M54 diagram for the fuel pressure regulator is inconclusive:.
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