Welcome Mark.
As George has said the send unit is in the top of the fuel tank, which is behind the rear seat.
On my 411 I don't believe it was possible to remove the rear parcel shelf without first removing the seat squab. However my 411 is an S5 with the integral head rests. If I remember correctly the seat squab effectively holds the rear parcel shelf in place.
If your 411 does not have the integral head rests then you may be able to remove the parcel shelf without removing the rear seat - I'm not sure.
If you do need to remove the rear seat, first remove the seat base. This just lifts up from the front - it's a very snug fit so it may take a bit of effort to lift it up initially.
This gives you access to two metal tabs with screws below the squab. Remove these and then move the squab upwards in-line with it's initial position. There are two hooks that the squab locates on so you have to lift the squab off these before you can pull it out.
You should find horse hair insulation and a steel bulkhead behind the squab which covers the fuel tank, however you probably don't need to remove this to access the top of the tank - I think you just need to remove the rear parcel shelf. Sorry about the vagueness, but it's probably 10 years since I had mine apart and I can't find my photos.
If you need or want to remove the rear bulkhead it is held in place by approx eight small screws hiding beneath the insulation.
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