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Mercedes 2003 and newer has fuel tank split in 2 partition, under back seat, one side has fuel pump and other side has level sensor. They are connected by wire and sensors & level balance hoses. Early wire use as plastic cover get easy damage the isolation by old gas or bad additives in tank create a risk of fire or just stop communicate. Same additives or old bad gas damage the 2 clear plastic hoses result in bad tank level reading or total malfunction of fuel system. Easy fix by replace full system or just the bad damaged side. KEEP IN MIND ALL WORK ON FUEL TANK ARE VERY DANGER TASK. RECOMMENDED TO WORK WITH FULL TANK OF GAS ( REDUCE SPACE OF VAPORS WITCH CAN EASY IGNITE).
Steps:
1-disconect the negative from battery (auxiliary too if present), discharge your hand static electricity by touching the metal frame!
2-remove the back seat cover
3-open the seal traded cap using special tool
4-all time replace and install new rubber ring seal
5-unplug wire connectors and disconnect hoses
6- extract parts and inspect wire and hose condition
7-replace damaged part or total kit
8-restore wire connection and hoses
ALL TIME HAVE A HELPER NEXT BY, A HANDY FIRE EXTINGUISHER AND CAUTION: "STATIC ELECTRICITY CAN IGNITE VAPORS" = USE COTTON NOT PLASTIC BASE FABRIC, keep all car doors and windows open, PUT YOUR CELL PHONE FARE WAY!
Steps:
1-disconect the negative from battery (auxiliary too if present), discharge your hand static electricity by touching the metal frame!
2-remove the back seat cover
3-open the seal traded cap using special tool
4-all time replace and install new rubber ring seal
5-unplug wire connectors and disconnect hoses
6- extract parts and inspect wire and hose condition
7-replace damaged part or total kit
8-restore wire connection and hoses
ALL TIME HAVE A HELPER NEXT BY, A HANDY FIRE EXTINGUISHER AND CAUTION: "STATIC ELECTRICITY CAN IGNITE VAPORS" = USE COTTON NOT PLASTIC BASE FABRIC, keep all car doors and windows open, PUT YOUR CELL PHONE FARE WAY!