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#1
10th January 2015, 10:38 AM
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http://www.partscats.info/audi/en/?i...234567890&hg=2
Maybe in-tank pumps or pipes?. I haven't looked inside the A8 but other older Audis had a saddle-shaped tank due to the rear diff in the middle and 4 plastic corrugated pipes to the corners to an octopus-like pump in the middle which sat in a chamber/sump that was kept full. If you look at #27 on the parts list looks similar but internal pipes are not shown. Last edited by snapdragon; 23rd April 2020 at 08:19 AM. 
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#2
10th January 2015, 03:19 PM
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Quick update .
Put 6 5 litre containers of fuel in to bring it upto just over 3 quartes full , spayed a bit of easy start in each air intake and she fired up. Been out for a run and shes back to normal. So looks like when one side of the tank empties she wont run.While I investigate further I just need to keep her above half a tank. I have just got my etka up and running so I have some reading to do to understand whats going on. Has anyone replaced the in tank pumps before . Is it diy or a nightmare?? Thanks again to everyone who has posted! PWACKA8
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2012 4.2TDI SE EXEC
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#3
10th January 2015, 03:48 PM
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I didn't think the D3s had this problem, or at least didn't have the complex multi-chamber venturi driven tank system.
 It's one of the only issues I still haven't resolved on my D2, after about 4 years of ownership, and it's not through lack of trying. I've had a go myself and had a dozen mechanics attempt the repair, including 1 or 2 pretty skilled ones, but I haven't been able to fix it yet. I've just learned to live with it and always keep it above half a tank. I'm considered locating a suitable replacement tank, complete with pumps. The problem with my car began when I bought it: Typical backstreet car sales place, made sure there was just enough fuel in their vehicles to keep the bottom of the tank wet, and not a drop more. They managed to let it run out and subsequently damaged the pump, which they had repaired by a local backstreet garage, who I think probably cracked some part of the tank receptacle for the pump housing. I discovered the problem shortly after buying it, but I was reluctant to take the car back in case they broke something else. Hopefully yours will be an easier fix. If it's anything like working on the D2 system and you're thinking of attempting it yourself, prepare to spend several hours cramped up in the boot, high on petrol fumes, cursing and swearing with screwdrivers in one hand and an endoscope in the other.
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------  ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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#4
10th January 2015, 07:26 PM
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That is a very odd but quite specific problem. Have you tried ringing a few Indies to see if they have an idea of what's up?
If you get as far as junction 8 (IKEA) next time, I'll bring you a coffee while you wait for the flatbed!
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2010 A8 SE Executive 4.2 FSI D4 2007 Mini Cooper S R56 2008 D3, gone, but not forgotten after 9 years and 90k.
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#6
11th January 2015, 12:31 PM
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If you want it looked at while you're in Surrey you could do worse than Camspec in Crawley, close to Gatwick. Their faultfinding is pretty decent
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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#7
11th January 2015, 12:32 PM
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On another note I think I will ba calling our forum owners on monday to see if they have a complete set of tank internals , both pumps .pipes ect.
I think theres too much going on to determine easily if there is a fault so I think best bet is replace the lot in one go. It may not be the cheapest way to sort it but with workjng in surrey and just being home at the weekends I just need to get it sorted.
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2012 4.2TDI SE EXEC
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