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D2 - Everything else Anything that doesnt fit elsewhere |
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#21
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Agreed, will drive it with a Jerry can in the boot and see.
Though it did die on petrol after the alternator/ battery died and before I replaced the pump. It would not start again with the 1/2 tank hence replaced the pump as a precaution. But could well be old pump died and new one had an airlock or no fuel as you say to suck up in the bowl.
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-- 2001 Audi A2 1.4 SE - Jaipur Red Pearl 2009 Audi D3 4.2 S8 - Avus Silver 2002 Audi D2 2.8 A8 QS - Audi Silver -- Last edited by Nognar; 8th November 2020 at 11:24 AM. |
#22
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Hello MJ, after lurking on this post and watching the developments, do you think it's worth asking my local garage (the one that fitted my replacement fuel pump within the last year) to refit the pump and pay special attention to this fuel return line? I'm still running out at about 1/3 capacity. I've attached a couple of screenshots from my ELSAWIN for reference.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend) 2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend) Last edited by johnny_quattro; 8th November 2020 at 01:12 PM. Reason: Missed plural of screenshots |
#23
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The return pipe is the convoluted piece in the centre of this pic
It needs to be tucked in to the fuel pump bowl. If its left loose it can cause the 1/3rd tank problem. |
#24
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Low battery voltage can definitely kill fuel pump, I am no expert or physicist but will try to explain best I can. It is a bit counterintuitive as you think lower would not hurt, only higher but I have seen it happen before. The problem is that as volts drop current can increase and too much current can kill it. Now again this is not straight forward as normally current is voltage divided by resistance so lower voltage should be lower current. But the deal is that pump motor actually has very little what what is called resistive impedance so it draws a lot of current at startup but as soon as it starts turning the inductive and capacitive impedance goes up and adds to the resistive impedance so the total resistance goes up and and current reduces. If the voltage is too low to start the pump turning then capacitive and inductive resistance never come into play and pump is stationary with little resistance and a lot of current going through it and eventually it can kill the pump.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#25
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MJ - thanks for the real-life photo, as opposed to the sanitised Audi manual version.
Ainars - thanks for the explanation of the low voltage situation. From what I understand of a possible shared experience with Nognar's issues mirroring mine (alternator was replaced in my case when it was actually the silver Yuasa battery at fault, and additionally a fuel pump replacement) it's all starting to fit together in my brain. Armed with that photo, I can now approach the garage with some level of confidence that I might be able to get back to the heady days of being able to use a full tank again. The garage did have initial problems fitting it and was refitted after a complete seal kit was ordered. Apologies for slight thread hijack but hopefully of some use to Nognar and others.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend) 2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend) |
#26
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I also ensured the return pipe was in the right place. It’s one of the things I checked when fitting the pump for the second time was it poked down into the right place.
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-- 2001 Audi A2 1.4 SE - Jaipur Red Pearl 2009 Audi D3 4.2 S8 - Avus Silver 2002 Audi D2 2.8 A8 QS - Audi Silver -- |
#27
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We may both be out of luck then, if my garage did it properly... I remembered that I saw a post by moltuae from a while back and I'm sure he had the whole tank replaced.
Found the post: http://forum.a8parts.co.uk/showthread.php?t=12072 I'm not sure I can stomach that expense right now so I'll keep my 5-litre can in the boot if the garage don't find anything wrong.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend) 2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend) |
#28
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Quote:
And to add to the frustration, with every failed attempt to fix it came the testing period and the embarrassment of having the car splutter to a halt, usually at the most inconvenient times, and then having to add a little petrol from a jerrycan to get me to the nearest petrol station.
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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 |
#29
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Interesting article here on another owner with the fault.
https://www.audizine.com/forum/showt...mystery-solved
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-- 2001 Audi A2 1.4 SE - Jaipur Red Pearl 2009 Audi D3 4.2 S8 - Avus Silver 2002 Audi D2 2.8 A8 QS - Audi Silver -- |
#30
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The implication there is that, assuming the pump is seated correctly, that the long bolt simply isn't tight enough and thus isn't compressing the D-shaped gasket and allowing air in to the pump. That would suggest some sort of lubricant is needed on the bolt thread which is compatible with petrol but which doesn't dissolve in petrol.
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