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Check the DIY section, I think there's a write up about it.

Seems to me, there's a weird screw on the bottom of it, a 2 part head to it. I happened to have had an upholsterer's screwdriver, which sort of has a notch cut out in the middle, which is what you really need, or you can get a wide screwdriver and cut out a notch. The screwdriver, from memory, has to spin around, without affecting the area or rod in the middle, which is why it has to be notched.

This is all a very easy fix. You take the rod out, and it's probably a bit rusted up, mainly from the tank not getting filled up for very long periods of time (a car that's sat for 2 years for example, or only got $3 of fuel at a whack). Without the tank being filled up, the float doesn't go up and down over the rod, and it eventually rusts.

The hardest part, is trying to read what to do, trying to understand it, then doing it. By the time you're done, you'll say, wow, that was easy!

jeff 1991 300d

added for reference

Attached Thumbnails

 

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1985 300TD Turbo Diesel Wagon
273,000 miles

Yes correct I can't see the wood for the trees it is here

http://www.peachparts.com/Wikka/W123FuelSender

I wanted to make sure that I had got the sender unit as clean as I could. I bought a set of security bits that had several two pronged driver ends and took the little screw at the bottom of the sender off.



Here you can see that even just under the bottom washer there is a load of crud that unfortunately could not be shifted other than by disassembly.

Here the outer casing is being pulled from the end with the electrical plug



You can clearly see the three delicate wires...

And here is a picture looking down the tube. Muck.



And this one is showing how much muck I had to scrape out of the bottom.



It is all cleaned out now and back together. It really is a 10 minute job.