Tank's INC Vent/Rollover Valve

Hello,

I have new EFI tank from Tanks Inc in my 67 Barracuda. The rollover valve they include states:

"If you are running a vent line it is important that the line is ran higher than the highest point on the tank including the fuel filler neck"

Has anyone used this valve? Only way to get it higher than the filler neck is to put it inside the car, which doesn't seem like a good idea as it would put fumes in the car...

Thanks,
Steve

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