Now this might sound really stupid, but part of the D2 S8 specification, IIRC, is an extra 10 litres or so (2 gallons roughly) fuel capacity.
I wonder if that's not a physically bigger tank but actually a cleverer venting system, combined with a different fuel sender/gauge?
And you've got a problem on Big Red that means it's reverted to "standard" fill but with an S8 measuring system?
Or maybe it is a physically bigger tank (at the top) with extra venting so it can be used? Does ETKA or similar help identify the fuel tanks and venting systems S8 vs A8?
This my S8:
0M6 Fuel tank
1E1 Activated carbon canister
1Z5 Increase in initial standard fuel filling
If that little valve is operated by the fuel cap (as well as a filler nozzle?) it surely (if like your A6) can only open up the vent. It appears to have a small shield to prevent it being pushed in too far or damaged.
Not sure that would do anything at all with the fuel cap on as it will just connect the top end of two pipes already connected at the bottom? Maybe just allow the fuel in the vent pipe to flow down smoothly as the level in the tank drops with use, a clever detail avoiding gurgling? Might have a look at the geometry tomorrow.
I assume, maybe not correctly, that as fuel level drops air enters the system from the top through a valve in the filler cap.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 13th November 2020 at 10:37 PM.
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