Cell phones while fueling.
http://www.fcc.gov/guides/wireless-phones-gas-stations
You may want to check this site out.
We have had one proven incident, several years ago, in our home town where severe damage and injury were directly linked to an RV'er fueling his gas powered van camper while his fridge was on. I'm not sure how close the gas filling port was located to the fridge exhaust.
Personally I have never given a second thought of fueling when my 5 er's fridge is on.
Logic seems to dictate that the chance of an incident may be possible but not very probable. I would assume that the issue would be magnified if you are fueling in an enclosed area, which, again is not probable.
GPG