What are the symptoms of a faulty gasoline fuel pump?

[MacJuliette]

The symptoms of a faulty gasoline fuel pump are: 1. Weak acceleration with jerking during sudden acceleration; 2. Difficulty starting the engine, requiring prolonged key turning; 3. Illuminated engine warning light; 4. Abnormal noises such as buzzing sounds while driving; 5. Abnormal engine vibration. The fuel pump is a lightweight and compact pump, categorized into in-line, distributor, and unit types. It requires a power source to operate, with its lower camshaft driven by the engine crankshaft gear. The fuel pump features a housing made of aluminum-containing material and contains a movable molded component inside. This movable component is at least partially made of a sinterable iron-based alloy material containing austenite, with a thermal expansion coefficient of at least 60% of that of the housing material.