Not a good idea to remove them. Vapour will build up and pressurise the tank. Or conversely, cold night the tank sides will want to pull inwards and could buckle (extreme case of course.)
Or fit a vented fuel cap, but on a fuel cell inside the car you probably would want to avoid that too.
I don't know if this helps or not but in NZ Cordia's came stock with no emissions gear so there's no charcoal canistor or any vapour lines to or from the fuel tank. (I assume this is what your talking about?)
