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If the ECU suspects any sensor is giving an incorrect value, it will light up the check engine light. The engine control module monitors all engine sensors to ensure they do not show the wrong values. Here is a more detailed list of the signs of a bad or failing fuel pump relay to look for: 1.

The relay can fail for many reasons, from dust to electrical power surges anything can affect the well-being of a fuel pump relay. If your car won’t start at all and you can’t hear the fuel pump when you turn on the ignition, it could also be due to a bad fuel pump relay.

The most common symptoms of a bad fuel pump relay are a stalling engine, performance issues, and a check engine light on your dashboard. Conclusion Symptoms Of A Bad Fuel Pump Relay