If you had bought your fuel in a southern zone then driven to a northern one where fuel needs to be winterized then gelling could be an issue. I would say that Illinois has winterized fuel because it is a cold climate area. More likey there is water in your fuel system lying in the fuel line under the body of the vehicle, the lowest point, that has frozen. It happens to diesels as well as gasoline powered vehicles. Get some fuel system antifreeze as well as keep your tank full as much as possible to minimize tank breathing with moisture laden atmospheric air. It is possible to thaw the ice with very judicious use of a propane torch to the fuel line. Just remember to keep the flame moving as the fuel line is made out of some sort of plastic material that will self destruct with enough heat.