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Its normal, all cars do it, usually its a bit worse in hot weather too. Its the fuel vapours that have expanded in the tank and when you release the cap it makes a hissing noise as they escape. A lot of cars have a valve in the cap that allows air in but not out...at the workshop where I work we have to test Jap import fuel systems. Must hold 5Kpa for 6 minutes...if your hearing a hiss, it means the fuel system is in good order.
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- '77 Sud Ti - Project car - C pillar "Ti" stickers needed!!
- '88 series II 33 1.7 Weber'd - More mint than yours! 
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