I just removed my fuel sending unit last weekend, cleaned it up, and replaced it. Working like a charm now.

The float had about 1/4" sludge on top of it causing a really slow response when refilled. The bottom had about 3/8" of sludge in it, causing the reserve contacts on the bottom of the float to not touch the concact points at the bottom.

The sending unit is removed with a 46mm or 1-13/16 socket. The assembly comes apart from a nut on the bottom. The resistor wires are very fine. Be careful not to break them if you try the cleaning route.

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https://goo.gl/photos/J8ZUVvAYiYqLxbD18

1989 560SL 111Kmi
2007 E550 4Matic 157 Kmi
2000 F250SD 7.3l, 1996 Explorer Ltd 5.0l
1965 VW Beetle Deluxe 115 Kmi
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Previous MB:
1983 240D Euro Manual 144 Kmi
1983 300SD 495 Kmi
1986 190D 2.5 100 Kmi
1986 300SDL 202 Kmi
1991 300D 2.5 Turbo 91 Kmi
1998 E320S4 (4-matic wagon) 140 Kmi