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      02-18-2022, 11:02 PM   #5
CRE
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Drives: 2007 Z4 3.0si Convertible
Join Date: Apr 2018
Location: Lakewood, Colorado, USA

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I know you figured it out. Just to clarify for anyone in the future. That's the port for the evap purge line from the fuel tank. It connects to a solenoid/valve below the intake which is mounted with the wire harness (as you've seen) and then continues to the fuel tank. If someone gets an evap diagnostic code for the fuel tank or fuel cap, the solenoid is a common culprit.
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