Excellent information Tom; I'm impressed. Where did you get that excellent picture? Perhaps I could find some more information on the bulkhead plug and whether it's a separate part there?
Is there a way to find out if what you refer to as the "circular bulkhead plug" is a separate part and whether it can be removed and replaced by the Euro version? Perhaps my friend, who is planning on visiting a Belgian BMW dealer today to check on the availability of the Euro tank as a purchasable part, should be checking on the bulkhead plug as well. Perhaps I should have my friend buy the bulkhead plug, if possible (and it looks like it would be much smaller and cheaper than the whole tank), to bring home and compare to the U.S. version of that part. (I just realized that given the time difference, he should have already gone to the dealer. But no word from him yet, so maybe that errand has been postponed.)
As to the computer needing to know the capacity of the tank in order to accurately project the range, that's a valid point as well. But, though I don't know the first thing about all this of course, I doubt that would stop the car from moving. In other words, if the computer incorrectly indicated the range but you knew you had about 1/2 gallon more fuel than the computer thought you did, you'd know that you had an extra 20 miles or so of range beyond what it was projecting. Also, I would imagine the computer has some way of measuring how much fuel remains in the tank (with the result that although it may underestimate the range of a full but "modified" tank, it would provide an increasingly accurate remaining range figure as the tank emptied). All just guesswork on my part.
Last edited by pdurham
on Tue Jun 03, 2014 10:59 am, edited 1 time in total.
i3 REx (Andesite Silver, Giga interior, all options except 20" wheels)
June 3, 2014 to present