Signs that may indicate the need to replace a fuel pump include difficulty starting the vehicle, reduced engine power, stalling, and a sputtering or jerking motion while driving.

A fuel pump module combines the fuel pump, fuel level sensor, and fuel filter into a single unit, ensuring a continuous supply of clean fuel to the engine.

Symptoms of a faulty fuel pump relay include the engine failing to start, intermittent engine stalling, and reduced fuel efficiency. You can test the relay using a multimeter or by swapping it with a known-good relay.

When choosing a fuel pump module, consider factors such as the vehicle's make, model, and year, the required fuel pressure and flow rate, and the compatibility of the module with your vehicle's fuel system.