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2006 Audi A8L Starting and Running Issue (Only runs fo a brief period)

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Old Jun 11, 2024 | 05:14 AM
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Default 2006 Audi A8L Starting and Running Issue (Only runs fo a brief period)

Good day, all,

I am working on restoring my brother's 2006 Audi A8L 98,000 miles. It sat for some time and had water damage and leakage on the passenger side front seat area. I have it at the shop and the leak has been fixed. It resulted from clogged sunroof drains.

The starting issue remains with it starting up runs perfectly for 30 seconds and dies no matter what. It will start back up and with no issue. Any suggestions on what to focus on next with the starting issues?

Attached are the results of the recent scans for reference.

I appreciate all the suggestions.




Ron
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Old Jun 11, 2024 | 07:25 AM
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Sounds like your fuel pumps in the fuel tank in the trunk are not functioning well:


From my understanding the first pump handles starting and hands off at around 30 sec to the 2nd pump. No codes for that problem.

Good luck!
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Old Jun 11, 2024 | 08:56 AM
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Yup, primary fuel pump (G23, right side) not running. On startup, both pumps run, then after 30s the secondary one (G6, left side) shuts off with the primary (G23) continuing on. So if the primary pump is inoperative, fuel flow to the engine stops after 30s.

More info here in SSP 282:

http://www.volkspage.net/technik/ssp/ssp/SSP_282_d1.pdf
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Old Jun 11, 2024 | 12:10 PM
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Originally Posted by AEightSilver
Sounds like your fuel pumps in the fuel tank in the trunk are not functioning well:

https://www.youtube.com/watch?v=mqa8YA7apiM
https://www.youtube.com/watch?v=qdYJG5pB8hs

From my understanding the first pump handles starting and hands off at around 30 sec to the 2nd pump. No codes for that problem.

Good luck!
Thank you
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Old Jun 11, 2024 | 12:12 PM
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Thank you

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Old Jul 8, 2024 | 08:34 AM
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Originally Posted by dvs_dave
Yup, primary fuel pump (G23, right side) not running. On startup, both pumps run, then after 30s the secondary one (G6, left side) shuts off with the primary (G23) continuing on. So if the primary pump is inoperative, fuel flow to the engine stops after 30s.

More info here in SSP 282:

http://www.volkspage.net/technik/ssp/ssp/SSP_282_d1.pdf
Dave
Do you have a part number for the right fuel pump? Do you recommend a vendor? I am currently looking at eBay, Rock Auto, and Amazon. There is a big difference in the price between these sites. Thanks for all of your help. My guy tells me the right main pump is dead.
Ron

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