Fuel return line and venting

[CompClassics]

If you have a roll over flap on the fuel filler pipe is the return line before or after the flapper? If the return line is before the flapper than you could have a problem in the event of an accident where the fuel could be allowed to escape the fuel tank more easily than if the return line was on the fuel tank side of the flapper. I would do as suggested above and put the return at the blocked off port at the top of the fuel tank and run the fuel tank vent with a rollover valve to the fuel tank filler pipe.