* Blown Fuse: Check the fuse box for a blown fuse related to the fuel injectors or fuel pump. The specific fuse will vary depending on the car model.
* Relay Problem: Fuel injectors are often controlled by a relay. A faulty relay prevents power from reaching the injectors. This can be tested by swapping relays (with care to ensure you swap like-for-like) or with a multimeter.
* Wiring Issues: A broken or damaged wire in the circuit leading to the injectors can interrupt power. This could be caused by rodents, corrosion, or physical damage to the wiring harness.
* Fuel Pump Relay or Fuel Pump Failure: The fuel pump needs power to send fuel to the injectors. If the fuel pump isn't working, even if the injector circuit is fine, there's nothing for the injectors to spray. A faulty fuel pump relay is a common cause.
* ECU (Engine Control Unit) Problem: The ECU controls the fuel injectors. A faulty ECU can prevent power from reaching them. This is a more serious issue requiring professional diagnosis.
* Immobilizer System: In some vehicles, the immobilizer system might prevent the fuel injectors from receiving power if it doesn't recognize the correct key.
* Low Battery Voltage: A very low battery voltage might not provide enough power to the fuel injectors.
What to do: If your car isn't starting and you suspect a lack of power to the fuel injectors, do not attempt to repeatedly crank the engine. This will drain the battery. Instead, start by checking the fuses and then consult your car's repair manual or a qualified mechanic to diagnose the problem. Trying to troubleshoot electrical issues in a car without the proper knowledge and tools can be dangerous.
