I have a 2011 E450 and the low fuel light is on all the time, despite having a full tank. I would have thought it might be the sending unit in the tank, however the gas gauge is reading correctly. When I have a full tank, the gauge will be reading full, however the low fuel light will still be on. Being the gauge is reading accurately, I assume the sending unit is good. Has anyone had this problem before? Any information would be helpful. Thanks Scott