A safety law that's been on the books forever. Every once in a while, it shows up as a ballot question during an election year to repeal it and gets soundly defeated. We hate pumping our own gas here!
I think Oregon is the same way also.
Yeah, I had the opposite problem in Oregon back in 2004 when I pulled up to a gas station, got out to pump my gas, and some guy damn near tackled me to keep me from doing it.
WTF? What are you doing, buddy? He said, "You can't pump your own gas." I said, "WTF are you talking about? OF COURSE I can pump my own gas, you idjit! Whaddya think I am? Lame or crippled or an idiot?"
Eventually it became clear it was a state law that you can't pump your own gas.
Personally, I think it's just another nanny-state thing. As long as the government is dictating, freedom dies.