[RocktimusPryme]

I have for a while been considering trying to make either a gas cap, or a use when needed device that would make old car filler necks more amenable to the size of modern gas pump nozzles.

My firebird is a PITA to put fuel in. If you hold it down full blast like a normal modern car it invariably not only stops before full, but also regularly spits gas back out at me. I end up having the baby the pump to get the tank full.

Ive worked out a few designs. Im sure I could make one for myself but Ive been trying to figure out how to make many of them cost effectively. I think they would sell at car shows. I think the easiest thing to do would be to use one of the modern filler necks that dont use a cap at all like some Ford models. Then just have tangs like a vintage gas cap so you could screw it onto your classic filler neck.