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I'm sussing out the new fuel lines I'm going to fit between my new EFI tank and the FiTech injection system. I need to know if the cap is vented, or if I need to use a separate vent.
 

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If it looks like the attached picture, it is vented. The small hole in the center is the vent. I run only the vented cap on my '66 EFI setup with no problems. I installed the Aeromotive Stealth II tank.
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Aren't vented caps designed as one way valves to let air in so as to avoid fuel starvation due to a vacuum condition in the tank. Isn't an extra vent line intended to let pressure out to minimize gasoline smells inside the car.
 
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