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Audi A6 Avant 2.0 TDi 2006 - Possible fuel problems and tank drain - Fixed #

Posted by Colin Calder on June 17, 2011, 1:29 pm

Year of Manufacture *: 2006
Engine Size and Code *: 2.0 TDi

Possible fuel problem with this as customer has almost run dry and then filled up with cheap supermarket diesel and straight away experienced problems with black smoke, rough running and engine rattle but NOT all the time.
Have seen the receipt and he definitly put diesel in it.
So, I am looking at draining the tank but not sure of best way to do it. The fuel does not smell as though it's contaminated but I need to eliminate it as a problem first before I move on.
Any help or advice on this would be greatly appreciated.

Re: Audi A6 Avant. Possible fuel problems and tank drain.

Posted by Kevin Apps <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on June 17, 2011, 3:09 pm, in reply to "Audi A6 Avant. Possible fuel problems and tank drain."
Kevin Apps

Colin.
Delphi do a diesel fuel tester. Cost,s about £600 if i remember correctly.

Kev.

Re: Audi A6 Avant. Possible fuel problems and tank drain.

Posted by Peter Warman <iframe src='https://members.boardhost.com/ukautotalk8/info/user=Peter+Warman' width='330' height='300' border=0 style='border:none;'> on June 17, 2011, 3:15 pm, in reply to "Re: Audi A6 Avant. Possible fuel problems and tank drain."

Make that £1300

Peter

Link: Delphi Diesel Tester

Re: Audi A6 Avant. Possible fuel problems and tank drain.

Posted by Kevin Apps <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on June 17, 2011, 7:46 pm, in reply to "Re: Audi A6 Avant. Possible fuel problems and tank drain."
Kevin Apps

Peter

Got mine at a Delphi run course, so i must have got a BARGAIN.
Kev.

Re: Audi A6 Avant. Possible fuel problems and tank drain.

Posted by martin simonsohn <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3223' width='330' height='300' border=0 style='border:none;'> on June 18, 2011, 9:49 am, in reply to "Audi A6 Avant. Possible fuel problems and tank drain."
Martin Simonsohn

hi if the customer ran fuel tank that low might it be that a load of sediment/water ect from the bottom of the tank has been drawn up into the filter it might be a good ides to remove the filter and replace having a look at what comes out of the filter.
the snap on diagnostic lists a fuel tank empty comand in the special functions.

either that or find the fuel pump relay.

are there any codes logged?

Re: Audi A6 Avant. Possible fuel problems and tank drain.

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on June 18, 2011, 2:20 pm, in reply to "Re: Audi A6 Avant. Possible fuel problems and tank drain."

Run the engine on a separate supply if you suspect a supply issue. HTH

Regards Mark

Modern cars, Its all wizardry and witchcraft

Fixed #

Posted by Colin Calder on June 26, 2011, 10:22 pm, in reply to "Re: Audi A6 Avant. Possible fuel problems and tank drain."
Message modified by board administrator June 28, 2011, 3:49 pm

Drained tank. Crappy fuel and did not need a fuel anylizer to figure that out. What a pig of a job. Fitted fresh fuel. Turned out that the intermitent rough running was EGR valve broken. Just goes to show how you can get caught by a coincidental problem and how one thing can throw you off the scent.
PS. Has anybody noticed that manufacturers seem to be putting things under the bonnet with sharper and sharper edges on them. Still, every time I cut myself I stick an extra fiver on the bill

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