If you have a fuel leak or other serious fuel-related emergency, your best course of action is to:
1. Turn off the vehicle immediately. This will cut the power to the fuel pump.
2. Disconnect the negative battery terminal. This is a more reliable way to ensure the fuel pump is completely de-energized.
3. Contact emergency services. Do not attempt to repair the fuel system yourself unless you are properly trained and equipped.
Trying to locate and disable the pump yourself risks injury and further damage to your car. Always prioritize safety and call for professional assistance in situations like this.