Hi
Did mine last year , it's in front of the rear offside wheel under one of the plastic covers. Mine is also a quattro with the BUL engine.
Don't know why its not part of the service schedule, petrol can still have crap in it and todays modern fuel systems are just as delicate as CR diesels. Well worth changing considering cost of fuel system parts, will be doing mine every 20k. By the way its easy enough to change, just slight spillage when detaching quick release connectors, just use a piece of rag to catch excess fuel and protect you from spray.