What Happens When the Fuel Pump Fails?

[GideonAnn]

The symptoms of a faulty fuel pump are: 1. Weak acceleration, with jerking during sudden acceleration; 2. Difficulty starting the vehicle, requiring prolonged key turning; 3. Abnormal noises, such as a humming sound while driving; 4. Illumination of the engine warning light; 5. Engine vibration. The fuel pump is a lightweight and compact pump, categorized into three main types: inline, distributor, and unit pumps. The fuel pump requires a power source to operate, with its lower camshaft driven by the engine crankshaft gear. Common fuel pump failures include: 1. Damaged check valve: Results in no residual pressure, causing starting difficulties; 2. Worn centrifugal pump impeller: Leads to reduced fuel supply pressure and weak acceleration; 3. Worn carbon brushes: Causes the fuel pump to stop, preventing startup (tapping the bottom of the fuel tank may temporarily restore operation); 4. Mechanical faults like rotor jamming: Increases the pump's operating current, potentially damaging relays or fuses.