The vapor recovery system is not to protect you, the consumer, as you
pump fuel. It is there to reduce the amount of volatile organic compounds, or VOCs, that are released into the atmosphere. While exposure to gas or diesel through breathing or direct contact is best kept to a minimum, ocassional contact while working on an engine is probably not something to get your panties in a wad about. Wear gloves and a respirator if you're worried about it.