BenzWorld Junior Member
Date registered: Nov 2008
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Here’s an update on my car.
Kajtek1 was right, the epoxy glue only lasted a week, after that the sending unit started leaking gas again. I didn’t get far with the dealership and decided to do this myself.
To remove the sending unit, both covers under the rear seat need to be removed. Under the left side is the sending unit and under the right side is the pump. The sending unit has 3 hoses and a wire harness that will need to be unplugged from the pump; and then you can pull the whole thing out, see the pic below. Press coupling (arrows) and remove fuel
Line. At this time also remove the pump; just pull it out of the gas tank. The new sending unit, part#2114704094 ($180) already comes with new hoses and the wire harness, but the hoses are bigger and won’t fit in the bracket attached to the pump. Remove the bracket shown on the pic below and install a new bracket, part #2114710241 ($12). After installing the new bracket, the pump can be placed back in the gas tank (right side), then place the new sending unit back in the gas tank (left side), and attach the 3 hoses and wire harness back to the pump. I have a 2003 E500, the new sending unit uses a different harness from then the one originally installed in the car; therefore, I had to buy a wire harness conversion, part# 2114400507 ($15) to be able to plug in the new sending unit. Place the pump and sending unit cover back on and your finished.
Jfamondone, if gas leaks after you fill the tank all the way up, check under the back seat to see if you can see the same puddle I had. If that is the case, could it be that seal #15 is damaged?