I have a 2004 diesel X5 and I have noticed that the fuel gauge seems to "stick" at just under half way and no longer reflects how much fuel is in the tank. The only way I can tell how far I can drive is using the trip meter as I know I can get about 500 miles to a tank.
The car has been to the dealers twice and they have replaced the sender unit and the siphon pump but this has made no difference. They are now talking about changing the tank which will be very expensive for me.
I know that all the fuel is being used as I am getting the same number of miles after filling up as I did before the problem occurred. I say this because the dealer seems to think that one side of the tank may not be emptying thereby showing a correct fuel gauge reading. Also, the car has run out of fuel twice and both times I have filled the tank with approx. 95 litres. This is the documented tank capacity so there is no way that there is still fuel in one side of the tank.
I'm loosing patience with the dealer as they have "fixed" the problem twice now but still don't appear to know what is causing it.
Anyone any idea what might be causing this? Is it possible that it is a faulty fuel gauge and nothing to do with the tank? If so, how does a fuel gauge become faulty?
Thanks.