Open the trunk, pull back the carpet (or plastic cladding) on the side with the fuel door, and pull on the cable (or cable lever) that releases the fuel door.
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1968 was also the last year for the "stacked" dual headlights, which were replaced with side-by-side dual headlights in 1969. In these early days of Cadillac and car production there is no emergency release lever from which the trunk can be opened.