They are tricky, but you can be sure that you get "fresh" fuel due to the large turnover.

Just hold it in and take it slow about 1/4-1/2 throttle. Although you can't just let it run by itself, i.e. it won't go all the way in, the inconvenience of letting the fuel in manually is more than offset by the freshness of the fuel AND get to look at the cool trucks.