Fifth is the on-board fire extinguishing system that are required. These systems are directed onto the engine itself and are activated instantly when the engine catches fire, reducing the chance for the car to completely catch fire and endanger the driver. The driver also has a manual activation control available. This has been in place on all cars since 1983, when an engine explosion and fire came very close to killing then-Funny Car driver Mike Dunn. All enclosed body cars must have a five-inch circular opening which will accept the nozzle of a fire extinguisher triggered by safety personnel. All vehicles must have a clearly marked fuel pump cut-off switch on a rear panel, accessible to safety crews.