Strong Indicators:
* Engine cranks but won't start: This is a classic symptom. If the engine cranks (turns over) but doesn't fire up, a faulty fuel pump is a strong possibility. The pump isn't delivering fuel to the engine.
* Weak acceleration or hesitation: If your car hesitates when you accelerate, especially when going uphill, or if acceleration is generally sluggish, it could indicate insufficient fuel delivery.
* Fuel pressure problems (requires a diagnostic tool): A mechanic can measure fuel pressure using a specialized gauge. Low fuel pressure is a direct indicator of a failing fuel pump.
* Surging or sputtering: An inconsistent fuel supply can cause the engine to surge or sputter, especially at higher speeds or under load.
* Whining noise from the fuel tank: You might hear a whining or buzzing sound coming from the fuel tank area, particularly when the ignition is turned on. This is the sound of the fuel pump straining. This is less common, as newer pumps are quieter.
Less Definitive Indicators (could be other issues):
* Loss of power: While this can be a symptom of many problems, a failing fuel pump can contribute to a loss of power.
* Stalling: Intermittent stalling could be related to a fuel delivery problem, but again, many other factors could cause this.
* Check engine light: The check engine light might illuminate, but it will likely be accompanied by a diagnostic trouble code (DTC) that can point towards the problem. A code doesn't guarantee it's the fuel pump; it could be a related sensor.
Important Considerations:
* Age of the vehicle: Fuel pumps generally have a lifespan of 100,000-150,000 miles, but this can vary depending on vehicle use and maintenance. An older car with high mileage is more likely to require a fuel pump replacement.
* Driving conditions: Regularly driving on rough roads or in extreme temperatures can put extra stress on the fuel pump, potentially shortening its lifespan.
Do not attempt to diagnose or repair a fuel pump yourself unless you are a trained mechanic. Fuel pumps work under pressure and can be dangerous to handle. Always have a qualified professional diagnose and repair the issue. They have the proper tools and expertise to safely assess the problem and determine the best course of action.
