THIS IS THE SECOND OCCURRENCE. DEALER REPLACED ENGINE ONCE. I REPORTED THE FIRST INCIDENT ON CONFIRMATION NUMBER (ODI NUMBER) IS: 10507237. THIS SECOND INCIDENT OCCURRED ON OR ABOUT 13 JULY 2013, CAR STARTED HAVING ILLUMINATING ODOR IN THE CABIN AGAIN THAT RESEMBLED FUEL. GARAGE AND CAR ODOR WAS SO BAD IT ACTUALLY ENTERED MY HOME AND I HAD TO LEAVE THE GARAGE DOOR OPEN TO VENTILATE. WENT ON LINE AND FOUND OTHER OWNERS EXHIBITING EXACT DEFECT. TOOK VEHICLE TO MERCEDES DEALER AND WAS INFORMED THAT A LEAK FROM THE FUEL TANK WAS THE CAUSE AGAIN AND IT WAS NOT FROM DAMAGE BUT FROM THE SENDING UNIT AND LINES. AFTER READING THE WARRANTY AND CONTACTING MERCEDES DIRECTLY, I CONTACTED THE DEALER AND INFORMED THEM THAT IT IS A COVERED ITEM AND THEY SHOULD MAKE THE REPAIR AS A WARRANTIED ITEM. I AM MAKING THIS COMPLAINT BECAUSE I BELIEVE THAT THE REPLACEMENT UNIT WILL BE THE SAME OEM PART THAT HAS NOT BEEN MODIFIED TO SOLVE THIS FAILURE FROM DUPLICATING LATER. *TR