Most cars have an inertial switch that shuts off the fuel pump in an accident, but I was not aware that a Workhorse chassis has one. Can anybody confirm that?
Ron - are you sure the fuel pump is not running or is that just a guess as to why it won't start?
Seems odd that the step quit working at the same time the engine problem began. Since both are electrical, maybe the problem is a fuse or a damaged wire. Was the "bump" a pothole or did you perhaps strike something with the underside of the chassis?
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL