What are the symptoms of a faulty car fuel pump relay?
2 Answers
Car fuel pump relay failure symptoms are: 1. Starter does not turn; 2. Starter has weak starting power; 3. Starter spins without engaging. The causes of car fuel pump relay failure are: 1. Severe battery discharge or short circuit; 2. Poor contact between starter commutator and brushes; 3. Open circuit, short circuit, grounding of starter relay coil, or poor contact of its terminals; 4. Loose wiring or poor internal contact of ignition switch; 5. Open circuit in starting system wiring, poor contact or disconnection of wires. The fuel pump relay uses a very small current to control high-power circuits, expands control range, and when the signal reaches a certain value, it can simultaneously switch, disconnect, or connect multiple circuits according to different contact group configurations to achieve automatic switching purposes.
The fuel pump relay is broken, that thing is like the fuel switch of a car. Once it fails, the car might not start at all. Having driven for so many years, I've encountered this situation a few times. Typical symptoms include turning the key with no response from the engine, or hearing a few sputtering sounds during ignition but the car won't start. If your car suddenly stalls while driving, especially on the highway, it might also be due to a relay malfunction. I've also experienced instances where the engine shudders or stalls at idle, and upon inspection, found that the relay contacts were burnt out. Possible causes include unstable voltage, water corrosion, or aging from long-term use. Every time I spot an issue, I first check the fuse box, locate the fuel pump relay, and try replacing it. If that doesn't work, it's off to the repair shop to check the wiring. In short, never underestimate this issue—fix it early to avoid breaking down halfway, safety first.
