I was driving one of my E300s the other day and I put a full tank in it. The car was filled to the brim. The gauge bounces around between a full tank, 3/4 of a tank and goes up and down. Anyone had this problem? Is the level sender in the top of the tank like the w124s? I was going to take it out and see if it needed to be cleaned or was dirty.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Iirc it is in top of tank. I'd check wiring including ground connection.

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Jim

It's behind the trunk partition panel on the back side of the tank at the top. Easy to access and remove. It is just a fraction of a turn to release and it's high up so unless your tank is super full it should not leak.

Once you get it out you will see it is a variable resistor arrangement with a couple pads that slide across two carbon tracks. The slider puts a short across the two tracks so the connections can both be at the same end.

Mine is kind of flaky at full tank but settles down once it's below 3/4. I need to replace mine, it's on the nice to have but not broken yet list.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech