I have a 03 MCS I did a diagnostic check and it came up as a bad leak pump part number 16-13-6-801-158. I got the part but I can not find where it is on the car. Can anyone help me by pointing me in the right direction or sending me a schematic. Thank you.

 

Not sure if this helps, but try this out:

http://www.realoem.com/bmw/showparts...26&hg=16&fg=10

GotMINI

 

a picture might help.... Try removing the fender liner of your Right Rear wheel, and look up in there. If that doesn't fix it. You might want to try the tank vent valve.