EE WAS ATTEMPTING TO FUEL EQUIPMENT. HE ENERGIZED THE FUEL PUMP. HE THEN GRABBED THE FUEL NOZZLE & FUEL LINE FROM OFF THE METAL HOOK. THE KEROSENE HEATER WAS PRODUCING A LARGE AMOUNT OF HEAT. EE WALKED PAST THE HEATER WHILE CARRYING THE FUEL HOSE & CLIMBED THE LADDER. THE PRESSURIZED FUEL HOSE CONTACTED THE HEATER CAUSING THE FUEL LINE TO SEPARATE & SPRAY FUEL ONTO THE HEAT SOURCE.