If your lucky and have a rear seat pass through, you can open the locked panel and pull up the mat and see the top of the fuel delivery pump sending unit combination. Otherwise ,you will have to access from the rear of the trunk.
the fuel pump is located in the gas tank take out the back seat and take the sending unit out of the tank and fuel pump is hooked to the sendind unit...
drop the gas tank and change the sending unit
Drop the fuel tank. Remove the fuel pump and sending unit assy. This is incorrect, the 2000 up deville has an access plate in the trunk, pull out the mat and it will be obvious you can change full sending unit and pump through it.
you will have to drop the gas tank and remove the sending unit this is were you will find the fule pump
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I have found though my experiences that 99% of the time the fuel gauge sending unit in the tank has failed.
inside the fuel tank.
Inside the fuel tank.
All fuel sending units are located in the fuel tank.
In the fuel tank
Check fuel pump or sending unit. Good luck