[porknubbins]

How is the rate of evaporation from the old type? I lose gas through evaporation from the new type anyway so they don’t even appear to work. It would be awesome to fill a jerry can with non ethanol fuel if it would last for at least a few months.

[toast0]

I don't think they changed the plastic when they changed the shape, so I'd expect fuel vapor to permeate the old plastic cans too (or at least some of them). A metal can with a good seal doesn't let vapor out, so be careful with big temperature changes.

[porknubbins]

Ah that makes sense. I can definitely see the pressure buildup in the plastic type. If there is a risk of exploding metal jerry cans that would be quite a hazard.