April 23, 2012 (CHICAGO) --Federal Investigators are looking at five thousand school buses from the 2008 model year, because they can stall without warning. The National Highway Traffic Safety Administration reports that in at least three cases, high-pressure oil lanes which connect the oil pump to the fuel injectors failed on international CE buses. In one case, a bus fill of students was going 55 mph when it started smoking and stalled. The driver pulled the bull to the side of the road. There have been no accidents or injuries reported. International CE buses are made by Navistar, which is based in Lisle. The company says it will cooperate with the investigation.