Here's what you should consider if your 2000 Mustang won't start:
* Check the obvious: Make sure the battery is charged, the connections are clean and tight, and that you're in the correct gear (Park or Neutral).
* Fuel pump: The fuel pump could be malfunctioning. You might hear a whirring sound when you turn the ignition on; if not, that's a potential problem. A mechanic can test the fuel pump.
* Ignition system: Problems with the ignition switch, ignition coil, or other ignition components can prevent the engine from starting.
* Starter motor: A failing starter motor won't crank the engine.
* Fuel delivery: There could be a blockage in the fuel line or a problem with the fuel injectors.
* Security system: If your Mustang has an aftermarket alarm or immobilizer, it could be preventing the engine from starting.
* Sensors: Various sensors (crankshaft position sensor, camshaft position sensor, etc.) can prevent the engine from starting if they're faulty.
Instead of looking for a fuel shut-off switch (which doesn't exist in this way on your car), you need to diagnose the *reason* your car isn't starting. It's strongly recommended to take your 2000 Mustang to a mechanic for proper diagnosis and repair. Attempting to fix fuel delivery issues without experience can be dangerous due to potential fire hazards.
