See the attached photo. The fuel sender is below the felt liner (blue dotted line). The seat back is fastened through the felt liner. So, the seat back (and the piece of plywood to which it attaches) has to come off before it is possible to remove the felt liner.

It's been a while since I did this repair, so I don't remember the exact steps. But I recall removing the bolts in the areas circled in green, as well as the plastic pieces on the sides of the seat (pink arrow). Basically, any fastener that goes through the felt liner needs to be removed. I think the hinges for the plywood panel are underneath the upholstered seatback - so the upholstered part may have to come off of the plywood part to access the hinge screws. Once that's all out of the way, you can un-tuck the felt liner from under the carpet and fold it back.

Attached Thumbnails

 

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1989 250TD Wagon 5-speed, 160,000mi ::: Dark gray metallic / black cloth
1984 190D-2.2 5-speed, 287,000mi ::: Silver-blue metallic / black MB-tex ::: SOLD

thank you for an awesome thread.

I have been struggling with my fuel-sender for a few days and this thread really helped me out.

Had to pull my feul tank out and derust as my newly aquired W124 200 1989 had been sitting in an old ladies garage for 20 years...

Very glad i found this forum.