Previously I had an issue with my 2000 A6 2.8L (101K) starting. It would sound like it wanted to turn over but couldn't. I would have to pump the gas in order for it not start and it would after 5 minutes of this. I eventually changed the fuel filter and the contents of it were grey deposits. This fixed the problem for a about 5 days. Tried to start my car and it wouldn't. Let it sit for a while and started it but it sounded like it wanted to stall. It would sit at about 1100 RPMs before finally coming to a rugular idle. Any ideas?

 

Look at your filter again, you might still have crud coming up from the tank. Could also be that your pump is getting clogged, injectors are really dirty, etc...

 

thats the beauty of using premium gas and a fuel system cleaner once every 2 months or so... keeps the deposit build up to a minimum. what you described just sounds like reallly dirty gas or hopefully not the fuel pump may be going because of having to pump through that dirty filter for a long time.

 

Yep probably bad gas and a plugged filter again.. I'm cheep so if it were me I'd remove the current filter and back flush it to get it a bit clean and put it back in. After a few days I'd do it again. Once it does not have any junk when it is back flushed I'd then put in a new filter.

PS use a white cloth as a strainer when you back flush it so you can see what is comming out.

PPS find a different gas station...