FiTech EFI system
I kept my regular gas cap.. my tank has a vent to the atmosphere, a solid line that exits beside the fuel tank filler , thu the rubber seal.
I installed as a returnless system, they suggested a tee into that hard line by the filler neck, so that's what i did. Seems to work fine.
Went on a short run on the highway at lunch.. nice and smooth .. very impressed.
My Lokar throttle attachment piece wants to slide around on me, but I will fix that later.