2.5v6 tdi air in fuel system! :(

m6rk · 08-13-2007, 02:45 AM

help!! audi a6 allroad wouldn't start yesterday, recovery came out, bled air out of the injectors and it started and ran fine.

However today it's doing the same thing. How can I go about diagnosing where the air leak is coming from??

Rocky-in-Connecticut · 08-13-2007, 04:07 AM

the diesel pump system is under a high amount of pressure. You would certainly be spraying fuel everywhere if you had a leak- perhaps your fuel pump itself is going out?

Vag Com is your friend..the 2.5TDI is not in the US so I do not have any experience with it. But with the 1.9 TDI, there is a procedure to check fuel pump timing. If the 2.5l is similar, check this using Vag Com.

Another component to check is the MAF. IF your TDI drives like you are towing a 5000 kilo trailer, then you are most likely looking at a MAF.

Thorsholm A4 tdi · 08-21-2007, 10:02 AM

Jusforfun · 10-19-2007, 06:00 PM

my guess lift (or priming) pump.

TDImne · 03-14-2012, 03:03 PM

i have a same problem with my car. don't know for sure what causes this, but when i leave my car with nose up some hill over night,all the fuel goes back in the tank and i have to bleed the whole system to be able to start it. but when i leave it with nose down the hill, it starts normal. so i am starting to think that the fuel filter is bad.
did you solved your problem??? and if yes please tell me how? cause i am runing out of hills to park

TDImne · 03-14-2012, 03:04 PM

oh and mine is not a quattro so it doesn't have a fuel pump in the tank...

08-13-2007, 04:07 AM	#2
Rocky-in-Connecticut AudiWorld Super User Garage is empty, add now Join Date: Mar 2005 Posts: 11,621	if you had a leak, wouldn't fuel be spraying everywhere? the diesel pump system is under a high amount of pressure. You would certainly be spraying fuel everywhere if you had a leak- perhaps your fuel pump itself is going out? Vag Com is your friend..the 2.5TDI is not in the US so I do not have any experience with it. But with the 1.9 TDI, there is a procedure to check fuel pump timing. If the 2.5l is similar, check this using Vag Com. Another component to check is the MAF. IF your TDI drives like you are towing a 5000 kilo trailer, then you are most likely looking at a MAF. __________________ Sig Begins--- "...We Reject as False the Choice between Our Safety and Our Ideals" -Barack Hussein Obama, President of the United States of America in his Jan 20, 2009 Inaugural address to the nation Handy Links: Stoney's A6 FAQ TT MkI FAQ Vag Com Tool Locator Ross Tech Vag-Com “I'd put my money on solar energy… I hope we don't have to wait til oil and coal run out before we tackle that.” —Thomas Edison, in conversation with Henry Ford and Harvey Firestone, March 1931 Current stable: 2001 Audi TT 225 Quattro 2002 Audi S6 Avant Quattro 1980 BMW 635csi Euro w/dogleg 5 speed ..and soon.... a 1973 Porsche 911 Targa (CIS) which I will be restoring.

08-21-2007, 10:02 AM	#3
Thorsholm A4 tdi AudiWorld Super User 1998 Audi A4 Join Date: Jun 2003 Posts: 2,721	check around the seals on the fuelpump __________________ some pics of the car here English is not my first language so my grammar and spelling might be off, please excuse this.

10-19-2007, 06:00 PM	#4
Jusforfun AudiWorld Super User 2007 Audi Q7 Join Date: May 2006 Location: Ireland, Dublin Posts: 7,290	What was it? my guess lift (or priming) pump. __________________ Q5 related Link to Q5 Spreadsheet Exterior pics Interiors Q7 related Link to Q7 Spreadsheet Exterior pics by color, model and rim size Interior pics A4 S4 Spreadsheet Link to Q3 spreadsheet

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03-14-2012, 03:03 PM	#5
TDImne AudiWorld Newcomer Garage is empty, add now Join Date: Mar 2012 Posts: 3	i have a same problem with my car. don't know for sure what causes this, but when i leave my car with nose up some hill over night,all the fuel goes back in the tank and i have to bleed the whole system to be able to start it. but when i leave it with nose down the hill, it starts normal. so i am starting to think that the fuel filter is bad. did you solved your problem??? and if yes please tell me how? cause i am runing out of hills to park

03-14-2012, 03:04 PM	#6
TDImne AudiWorld Newcomer Garage is empty, add now Join Date: Mar 2012 Posts: 3	oh and mine is not a quattro so it doesn't have a fuel pump in the tank...