IF it was DRY.. it means no fuel is being injected into or thru the injector..
I suspect the injection pump.. you say the "back cylinder".. so it will be easy to remove the steel line ON THE PUMP to SEE if fuel is coming out of it..
Do yourself a BIG FAVOR & use the double wrench method.. hold the pump "nut" while loosening the line nut.. or you stand a chance in loosening the pump [delivery valve holder] nut before the line comes loose..[not good]
You can do the same for another cylinder ON THE PUMP to compare the fuel delivery. [squirts]