I understand that when the fuel gauge light comes on the litres left in the tank should be 3.5ltrs (pressing 1 and 1000 on the small buttons together). I had a chance tonight to calibrate it. So on come the light, I pulled over and turned the trim pot behind the blank plug but could only get it down to 5ltrs. There was another quater turn of adjustment, but 5 ltrs was it.
I found the point where 5 ltrs shows and then adjusted back more to where I thought 3.5 ltrs would be. The range was showing 42miles, but I did another 15 miles and this only dropped to 40miles. The capacity still reads 5ltrs.
Filled the car to the brim and it shows 46ltrs. (Took 53ltrs to fill, so I know there must have been around 3 ltrs in the tank when the light come on)
Is this what to expect? My M3 which was fited OBC from new goes down to zero miles when you are really low.
The OBC has the proper 318is code plug fitted.
Any advice or pointers would be much appreciated
