Help appreciated

Syleng1 said

yes you do but there are pressure check valves now to allow air to replace the used fuel one way but will not allow vapor out the other way.

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Yes there are. I was just stating you still have to vent it. I see a number of cars with no vents when things get switched around. Doesn't a Demon have a vent off the fuel tank filler? I thought they did unless they were Ca.