I got 2001 BMW X5 with 150K miles and took the x5 to dealership with fuel guage problem. The dealer diagnosis with fault in system for fuel sensor/pump in the rear passenger side. Can you please tell me where is the fuel sensor located it or do I need to replace the whole fuel pump? Can I just replace the fuel sensor instead of whole pump and the sensor. The dealer want to charge $650 for replace the fuel pump/with sensor.

Thanks,
uhenry1