Chrysler is refusing to recall about 2.7 million Jeeps the government says are at risk of a fuel tank fire in a rear-end collision. The National Highway Traffic Safety Administration asked Chrysler to voluntarily recall Jeep Grand Cherokees from 1993 through 2004 and Jeep Libertys from 2002 through 2007. But Chrysler refused, saying the vehicles are safe. It's rare for a car company to refuse a recall, and while the National Highway Traffic Safety Administration can order one, it needs a court order to enforce it.