I have a French built 1953 11BL. I recently replaced the fuel sender unit and it was pretty straight forward. I was able to access the unit through the trunk. There’s a metal plate in the floor the trunk. Remove two screws and it comes off. Below that is the sender unit which is held in with three screws and you’ll see the wires going to it. Disconnect, remove the unit, and then replace with a new unit. Double check the unit is grounded well. Hope this helps.
Kirk
Robert Filbey