Well, the Fuel Pump is usually in the fuel tank on a "Hanger" assembly along with the fuel gauge sending unit (the sending unit is either a Reostat who's moveable arm is on a float that floats in the gasoline). You can access this assembly from the top of the fuel tank. If there is a hole in the bottom of the middle of your trunk you may be able to get at it there, but I doubt it. Dropping the tank is a hassle, make sure the tank is almost empty if possible and the hoses connected to the top of the tank can be a bear to get disconnected. Make sure to check all of your wire connections (especially) the ground wire near the fuel tank, and the relay with a volt/ohm meter before condemning the fuel pump.
Should have access after removing inner door panel
check in the glove box....there should be an access panel there
In order to replace the cam sensor on a Buick Regal 3.8L, you must first access the main dash board from the back by either entering the hood or removing the panel, and then crossing the two wires in question.
autozone.com
Yes, a Buick Rendevous does have an easy access panel to the fuel pump.
take the panel off the door, everything is inside
Should have an access panel inside trunk
On the side of the dashboard on the Passenger side.
passenger side floorboard panel
I have a 2001 Buick Regal and in order to change the tail lights or Lic. plate lights you must first open the trunk lid. Now look inside the trunk lid you will see 8 or 9 plastic wingnuts, remove these wingnuts and the complete plastice panel can be removed from the trunk lid. Simply replace the buned out lights and reinstall the panel. TAL
some fuses are on the side of the dash on the passenger side as you open the door, then there are two other fuse boxes under the hood against the fenders (you will probably have to unbolt the crossbraces to access them).
Access through right side of trunk - remove panel and replace as complete unit