[Dodge Doll]

It's possible that moisture can build up in a fuel tank that is let to sit with too low of a level of fuel.

I owned an ancient Aspen once upon a time, and it was infamous for that issue; no one told me to keep it topped up with gas, either.

It wound up that I'd need to add a pop-can's worth of methyl hydrate to the fuel tank when I gassed up, about once a month.