Depends on what Cadillac you have, but most of them use a solenoid that opens the filler cover when you push the button on the dash. If the button is not working, there is a manual release cable inside the trunk near the filler. Problem could be the solenoid, wiring or a stuck latch behind the cover.
Some newer cars don't have gas caps, just push the gas nozzle into the center of the filler, a flap will open. If your still stuck, go to a full service station.
SOURCE: Attendant left gas cap off 2003 Cadillac DTS. Need to delete msge
disconnect battery for 5 minutes and reconnect.
SOURCE: the gas tank door wont open for my 1994 Cadillac deville
Sounds like the door release actuator is sticking. Try lubricating the latch when the door is open. In addition to using the button on the dash, you should be able to open the door pulling the wire adjacent to the fuel door inside the trunk.
Testimonial: "didn't work"
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