To stop fuel flow in an emergency situation with a 1994 Trans Am, your best course of action is to:
1. Turn the ignition key to the "off" position. This is the most immediate and effective way to stop fuel flow.
2. Disconnect the battery's negative terminal. This will completely cut power to the entire vehicle, including the fuel pump. This is more involved, but ensures no electricity reaches the fuel system.
Important Note: Never attempt to manually shut off fuel flow by tampering with fuel lines directly. This is extremely dangerous due to the risk of fire and serious injury. Always prioritize disconnecting the electrical supply as described above.