1. Fuel pump relay stuck in the "on" position. The fuel pump relay is a small electrical switch that controls power to the fuel pump. If the relay is stuck in the "on" position, it will continue to send power to the fuel pump even when the car is off.
2. Faulty fuel pump control module. The fuel pump control module is an electronic device that controls the operation of the fuel pump. If the control module is faulty, it could send a signal to the fuel pump to continue running even when it should be off.
3. Short circuit in the wiring. A short circuit in the wiring can cause the fuel pump to receive power even when the car is off.
To troubleshoot the problem, you can start by checking the fuel pump relay. If the relay is stuck in the "on" position, you can try tapping on it with a screwdriver or other object to see if it will dislodge it. If that doesn't work, you can replace the relay.
If the fuel pump relay is not the cause of the problem, you can then check the fuel pump control module. The control module is typically located under the hood of the car, near the fuel pump. If the control module is faulty, you will need to replace it.
If you are not comfortable performing these repairs yourself, you can take your car to a mechanic to have them diagnosed and repaired.
In the meantime, you can disconnect the negative battery cable to prevent the fuel pump from running continuously. However, this will also disable other electrical systems in your car, such as the lights, radio, and air conditioning.
