well, it wasn't intentional.

no damage... though i guess i wouldn't really know for sure since i'm not a mechanic, but i haven't experienced any change in any performance or mileage or whatever to indicate a problem.

i'm not sure how running out of fuel would damage the injectors though. besides, i'm pretty sure the FEH's computer actually shuts things down before you're actually 100% out of gas and sucking air into the fuel delivery system.