Apparently in this model, per BMW, 75% of the gas is in one side of the gas tank, the other 25% is moved over when the tank has used the 75%. This is done by a computer chip. When the car was 1 year old, it died with 1/4 tank of gas while doing 55 mph on a highway with a car on my tail - almost got rear-ended. BMW replace the Fuel Pump - no change, it did it again at 1/4 tank of gas. BMW replaced fuel pump again, no change. This went on for over 1 year in and out of the shop leaving the car for weeks on end and BMW could not solve the problem. I asked them to check with headquarters to see if anyone else had this problem and was told each dealership tracks their own repairs, there is no major database listing all issues (hard to believe espcially in light of the need for recalls). I gave up finding a solution and now simply keep the car filled with gas and pray it dosn't happen again.
Has anyone had this problem?
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The fuel level claim is false. It should be kept even and is done so by means of a series of hose and a siphoning effect. NO CHIP
There should actually be a nationwide information database, but is more so for more common faults and remedies. BMW in America should also have a technical support, its only proper
Does sound like a fuel transfer issue. Get some parts schematics from parts and you will see what i mean
Good luck
