MB has been saying that the reformulated fuel is causing the sending unit failure for 3 years. I believe that in this time that a longterm fix should be availible. Keep bugging your dealers to fix the problems or they will FORGET when your car is out of warranty!! In fact I would call the home office in NJ & file a formal complaint!!
MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. TECH
190E 2.3 ITS RACECAR