The tank things isn't a problem. The problems are lazy careless dealer crews.
I had seen before that the X5 has two taps and so I asked the dealer to get me a second one. I assembled it myself because I don't want to wait for ages that they get it done. Drill a correct sized hole where is the marker at the tank, fit the tap with two bolts and fit on the 2 fuel line with with a T piece to the carburetor.