What is the fuel pump relay switch for?

The fuel pump relay switch is responsible for controlling the power supply to the fuel pump. When the ignition is turned on, the relay switch sends a signal to the fuel pump, which then begins to pump fuel from the fuel tank to the engine. The relay switch also helps to protect the fuel pump from damage by shutting off the power supply if the fuel pressure becomes too high or too low.

Here is a more detailed explanation of how the fuel pump relay switch works:

* When the ignition is turned on, the battery sends power to the fuel pump relay switch.

* The relay switch then sends a signal to the fuel pump, which begins to pump fuel from the fuel tank to the engine.

* The fuel pressure sensor monitors the fuel pressure and sends a signal to the relay switch if the pressure becomes too high or too low.

* If the fuel pressure becomes too high, the relay switch will shut off the power supply to the fuel pump to prevent damage.

* If the fuel pressure becomes too low, the relay switch will also shut off the power supply to the fuel pump to prevent the engine from running lean.

The fuel pump relay switch is an important component of the fuel system and helps to ensure that the engine receives the proper amount of fuel to operate properly.