Fuel cell-fuel line plumbing ?

crackedback said

You sure one isn't a vent and the other a return line. Look for a check ball in one of them. That's the vent line.

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u can buy a check ball fitting for the vent. If u rolled the car upside down, the gas would run all over the place w/ it done like ur drawings. I like to run the vent up hi in the trunk w/ a couple of coils at the top, then back down thru the floor to underneath. Won`t pour out that way either.