The 1992 Buick Roadmaster fuel shutoff switch isn't a readily accessible, easily located switch like some modern cars. There's
no easily accessible, manually operated fuel shutoff switch. Fuel delivery is controlled electronically, and the system relies on the car's computer and safety systems to cut off fuel in the event of a crash.
If you need to shut off the fuel supply in an emergency (like a fire), your best bet is to disconnect the negative (-) battery cable. This will cut power to the fuel pump and prevent fuel flow.
