Just brought home my 98 528i tonight! Pretty exciting as it is my first BMW! I had driven it two different times for ~30 miles prior to purchasing & everything seems to be in excellent working condition. Coming home tonight, I noticed fuel gage went from a little over 1/2 tank, down to 1/4 tank, then down to empty. No fuel is leaking. I shut the engine down & restarted & the fuel gauge goes back to 1/2 tank.
Prior to purchase, I had a mechanic check it out & all was good except it had an Instrument Cluster 09 Tank Level Sensor error code. Anyone heard of this fuel sensor going bad? Bad connection to instrument cluster? Any other ideas?