This is the beauty of MB and actually VW and Audi. To gain access to sending units or fuel pumps, you don't have to remove the fuel tank. For my Passat and my neighbor's Audi 100, there is an access panel in the rear floor, above the tank. To get to the sending unit in my SD and the W123 sedans, you just remove the first aid kit and there you go. Now, I know how to get to the one in my TD. These are cars were definetly built to be worked on.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member