I am not sure about a 65, but on a 64 the gas flap is on the tail panel of the car, not the bumper. The flap is beneath the trunk lid and in the center of the tail panel. There is a small handle on it and it pulls out. The gas filler neck goes up into this area. It has the Pontiac letters on it. If the gas tanks are the same for 64 and 65 (which I believe they are), then the arrangement on your 65 should be the same.
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Jim
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