jeffkruse

Not sure is anyone remembers, but I was having issues with my 2004 Audi A8L 4.2L when I got down to about a 1/4 tank of gas, when driving the car would just die. I would coast over to the side of road and turn of ignition and start the car and continue on. This never happened before I had the fuel pumps replaced. Took it back to that shop 3 times and they could not find anything wrong with it. So after a few months I took it to another shop and they said it is the Fuel Suction Pump on the passenger side, but said it was 700.00 to replace. I thought that was expensive since the part was only 150.00 and labor was only 2.4 hours. How hard would it be for a novice to replace this part? Thanks

Hannibalacp82

(3/4 of my post was eaten so I had to come back and edit it....sorry!)

Makes sense that it is the suction pump and not the fuel pump as the suction pump makes sure the fuel pump is always surrounded by fuel under cornering or braking despite the fuel level. From my AllDataDIY guide (worth the

jeffkruse

Looks like I did not get the all the post, but I am a member of alldatadiy.com and I can see the suction pumps just wanted to make sure I could replace them. Thanks for your help

Hannibalacp82

Damn it my post got eaten again.

They do have the step by step guide in AllDataDIY. If you can't find it let me know and I'll dig up the link. Took me a few min to find it.

mishar

There is no fuel suction pump. Right pump imploys Venturi effect to transfer fuel. It is simple part that can't be broken, only disconnected hose. Check SSP 282 http://www.volkspage.net/technik/ssp/index3_eng.php to see how it works.

jeffkruse

Thanks for the quick reply. I noticed it stated 2003 I have a 2004 would that be different?

Hannibalacp82

I guess that is a difference between the S8 and the A8.

MP4.2+6.0

D3 was intro'ed in Europe in 2003, but only in 2004 in USA. Thus if a Euro SSP, 2003 date isn't surprising. Notice forum board itself for D3 is labeled as 2003-2010. Tricky part is in Europe a 2003 would be a D3, while in USA they were still end of run D2's. Same issue in 2010's, and issue to come with circa 2017 D4's and D5's.

Hannibalacp82

Always interested in learning more so I dug in per your comments,

#4/8 are your Suction Jet "Pumps" with #2/10 being the Fuel Delivery Lines and #3/9 being your Suction Jet Lines. #5 is the Expansion Tank and #17 is another Suction Jet Pipe.

If I understand this correctly the Fuel Pumps themselves (#1/11) suck in gas from the baffle they are located in rather than just tank to make sure they are always surrounded by fuel. This is accomplished by having the Suction Jet Pumps suck in the gas from the tank. They are a venturi pump rather than a mechanical pump.

Back on the same page now?

mishar

No difference there.