I taught my mom how to pump gas. Actually I insisted she learn. When I was growing up she always said the deal was Dad would fill the gas tank (he worked and she didn't during our early years), and I do remember over the years times when she was freaking out about being low on gas and yelling at my dad about it once she finally made it home (which in turn upset us kids). It wasn't that she didn't have the money, it's that she didn't want to learn how to pump gas - that was Dad's job.
So when I learned to drive, I made her get out of the car and watch me pump gas so she would know how to do it and not get stranded somewhere. She does it now, especially since she has her own car and Dad has his.
It may be a generational thing, and I admit I am an SS about this toward her, but her occasional chosen lack of independence both aggravates me AND has made me very self-sufficient.