What are the symptoms of a faulty fuel pump?
2 Answers
The symptoms of a faulty fuel pump include: 1. Weak acceleration with a jerking sensation during sudden acceleration; 2. Difficulty starting, requiring prolonged key turning; 3. A buzzing abnormal noise while driving; 4. Engine vibration. Causes of fuel pump damage: 1. Poor fuel quality can lead to various impurities or foreign objects in the fuel tank, where the filter cannot trap small particles, causing damage to the fuel pump; 2. Not refueling in time results in insufficient cooling and lubrication, leading to overheating of the electric pump motor; 3. Long-term failure to replace the fuel filter causes severe blockage in the fuel supply system, making it difficult for the fuel pump to operate and leading to damage due to prolonged high-load conditions.
The most common symptom of a faulty fuel pump is extreme difficulty starting the car, especially when cold starting. When you turn the key, the engine cranks noisily but won't fire up, requiring multiple attempts before it starts. Once running, you'll notice obvious power loss - the accelerator feels weak when pressed, making climbing hills or overtaking particularly strenuous, as if the car is being held back. The most dangerous symptom is sudden stalling while driving, such as at low speeds or when waiting at intersections - the entire vehicle just dies. The fuel tank area may also produce continuous humming or clicking noises, especially noticeable during quiet nights. If these issues are ignored, fuel consumption may increase and the engine warning light might illuminate. I recommend stopping immediately upon noticing these signs - don't force the car to keep running to avoid worsening the problem and causing engine damage. Have it towed to a professional repair shop for fuel pressure testing to confirm the issue.
