Hybrid-electric vehicles ease emissions-related headaches for auto makers, but they also create new ones for vehicle engineers. That’s because even when HEVs are running under electric power only, the fuel systems of their internal-combustion engines still can generate smog-causing gasoline vapors, which can account for as much as 20% of a vehicle’s total hydrocarbon emissions. With HEVs, plug-in HEVs and extended-range electric vehicles becoming more popular, coping with the fuel-system ...

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