I have a 2003 X5 that will not go past 3/4 of a tank on the fuel gage even though it is full. The fuel gage went faulty before and I ran out of gas because the gage said I still had a 1/2 tank. It was still under warranty so they replaced the whole gage cluster. A couple of months after that the gage quit going past 3/4 of a tank, and of course the warranty has ran out too. Does anybody have any idea what could be wrong?