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There is no 2004 Aurora. The last model made was 2002.
Here is a link with info on the Oldsmobile Aurora 2001-2003 http://consumerguideauto.howstuffworks.com/2001-to-2003-oldsmobile-aurora.htm
Anywhere from $31000-$35000
.050"
3.5 is 18.5 gallons, 4.0 is 17.5 gallons
It is inside the car above the passengers feet. You must remove the lower cover plate and glovebox to be able to see it. It is somewhat difficult to replace.
Probably every 50K should be sufficient
The fuel sending unit is part of the fuel pump module. To replace it you must drop the gas tank.
In the fuel tank - cost will be $200-$400 to replace
The year of the aurora is important...i have a 2002...just bought 4/16/2011. The dash lites are a bit dim. A common problem for these... I found a specialty -dash cluster in my answer sites...google ' year' aurora dash cluster lites dim...the electronics shops came up...they wanted $ 169- $189 to repair gages...i don't berlieve the bulbs are replacable on an individual basis...
In Aurora il they charge $180 for each one the 2002 tahoe has two converters.
There is no fixing the actuator, replace it with a new one.