1. No Power to the Fuel Pump: If the fuel pump relay is completely faulty and does not provide any power to the fuel pump, the car will not start and the fuel pump will not be able to deliver fuel to the engine.
2. Intermittent Power: In some cases, a failing fuel pump relay might provide intermittent power to the fuel pump, leading to erratic engine behavior, stalling, or rough idling.
3. Decreased Fuel Pressure: A faulty relay might not be able to provide the necessary voltage or amperage to the fuel pump, resulting in decreased fuel pressure. This can cause issues such as hesitation or loss of power during acceleration.
4. No cranking: In some models, a bad fuel pump relay prevents the starter motor from engaging and the engine from cranking.
It's important to note that there can be several other reasons why a car may not start or run properly, such as issues with the ignition system, fuel injectors, or sensors. If you suspect that the fuel pump relay is the cause of the problem, testing and diagnosing the issue properly is crucial to determine the exact source of the problem.
