The fuel pump relay acts as a switch, controlling the power flow to the fuel pump. It prevents the fuel pump from running constantly, only activating it when the engine needs to start or run. This protects the fuel pump (preventing burnout), conserves battery power, and is part of the overall vehicle safety system (preventing fuel leaks when the car is off).
In short, its function is to control the electrical power supplied to the fuel pump based on signals from the engine control module (ECM) or other relevant sensors.
