Engine Starting/Running Issues:
* Difficult starting: The engine cranks but takes a long time to start, or only starts after several attempts. This is a classic symptom as the pump isn't providing enough fuel pressure to the engine.
* Stalling: The engine may stall, especially after accelerating or when idling. This suggests insufficient fuel delivery.
* Hesitation/Surging: The engine may hesitate or surge during acceleration, indicating inconsistent fuel supply.
* Engine won't start after running: If the car runs for a while and then refuses to restart, this is a strong indicator of a failing fuel pump. The pump might be overheating and failing to build pressure.
* Loss of power: A weaker fuel pump might not be able to supply enough fuel to meet the demands of the engine under load, resulting in a loss of power, especially when accelerating.
Other Signs:
* Fuel pump whine: You might hear a whining or buzzing sound coming from the fuel tank area, especially when turning the ignition key to the "on" position (before cranking). This is the pump trying to build pressure but potentially failing to do so effectively. The sound may be faint or loud.
* Smell of fuel: A strong smell of gasoline could indicate a leak in the fuel system, which may be related to a failing fuel pump or a damaged fuel line.
Important Considerations:
* Check the fuel filter: A clogged fuel filter can mimic the symptoms of a bad fuel pump. Replacing this is a cheaper and easier fix first.
* Fuel pressure test: This is the most definitive way to diagnose a fuel pump issue. A mechanic can measure the fuel pressure to see if it's within the manufacturer's specifications. Low fuel pressure strongly indicates a failing pump.
* Listen carefully: The fuel pump's whine is sometimes hard to detect, especially if the vehicle is noisy. Try listening closely while someone else turns the ignition key on and off.
If you suspect a bad fuel pump, don't delay getting it checked. Driving with a failing fuel pump can lead to further engine damage. A mechanic can accurately diagnose the problem and recommend the appropriate repair.
