I'm not that familiar with 63s but I would guess that they did not originally come with a vented cap. On my 65 and 66 Big Cars there is a vent nipple on the filler neck close to the filler cap. Tubing is attached to this nipple and the tubing snakes/bends around such that it will vent the gas tank put not allow fluid gas to escape. I recall that the tubing passes thru the trunk just behind the trunk lock mechanism. The filler caps are non-vented on my cars. Perhaps a previous owner put on the vented cap. If you have such a nipple on your filler neck and it does not have the tubing then you will certainly smell gas. By the way that is a VERY nice 63 you have.
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65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8.
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