'99 A8 fuel pump

[dgraber460 at aol.com]

I have a friend that has been quoted $900 plus labor for a fuel pump for his 99 A8. The car has ~180k miles and he is thinking about just dumping it.
I would like to at least help him try to sell a _running_ car. Is there anything exotic about these compared to the other large chassis cars.
What's so super secret, super duper, super expensive on these baby's? 
TIA


Dennis 
Denver