I have never used the adapter and have found that when the fuel neck filler doesnt open properly as in when using the wrong nozzle you can still fill up with the fuel nozzle pressed up against the metal blocker in the fuel neck. You just have to pump slowly, the fuel still enters the tank. also make sure your car is unlocked.

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Current Rides:
2011 X5D Loaded (Oil Burner)
2012 VW Passat SEL TDI (Oil sipper)
2008 Honda CBR 1000
2007 Harley Davidson Sportster XL 1200

Retired:
2010 Mercedes GL350 (in the shop too much)
2009 335D
2008 Audi A6 3.2 Quattro loaded
2005 BMW M3 Black compertition Pkg with Nav