What is the reason for not hearing the fuel pump sound when turning the key?
3 Answers
The reasons for not hearing the fuel pump sound when turning the key are as follows: Fuel pump damage: The fuel pump is damaged. The fuel pump does not start, and no oil pressure is established. During secondary ignition, the crankshaft sensor forcibly starts the pump. The function of the fuel pump is to draw gasoline from the fuel tank and press it through the pipeline and fuel filter to the float chamber of the carburetor. Insufficient fuel: First, check whether the fuel level is sufficient and see if the fuel pump can draw fuel. If the fuel level is sufficient, check the fuel pump fuse. If the fuse is not broken, it is recommended to go to a 4S service station to check the fuel line, not the clogged fuel filter.
I've encountered this issue several times before. After turning the key, I didn't hear any sound from the fuel pump at all, which really worried me. There could be several possible reasons for this. The most common one is a blown fuse, especially the one dedicated to the fuel pump. If the current is too high or there's a short circuit in the wiring, it will melt to protect the circuit. Another possibility is a faulty relay. That component controls the on/off function of the fuel pump. If the contacts wear out, the signal won't get through, and naturally, the fuel pump won't work. The fuel pump itself could also be the problem, such as a seized motor or aging seals causing it to stop running, or loose/oxidized wiring connectors leading to poor contact. I remember one time when I spent ages troubleshooting, only to find out that the undercarriage wiring had water ingress and rusted, causing a short circuit. After cleaning it, everything worked fine. In short, don't delay with these minor issues; troubleshoot early to avoid getting stranded on the road. First, check the fuse box and relay locations yourself, referring to the manual to find the corresponding components. If that doesn't work, you'll need to consult a professional mechanic for diagnosis to avoid further trouble.
When turning the key, not hearing the fuel pump humming happened to my car, and I guess many people like me thought it was a big trouble. Start with the simple checks first. Blown fuses are too common - just use a test pen to check if it's broken and replace it directly. The relay might also fail, with its contacts burnt out or the coil damaged, but replacing it is easy and costs just a few dozen bucks. The fuel pump itself has a high chance of failure too, with the motor stuck or the pump body clogged, making it run silently. If everything checks out but there's still no sound, inspect the main wiring harness, like loose connectors or dust buildup in the engine bay affecting the current. Last time I encountered this, I did the inspection myself and found cracked, aged wires causing an open circuit. I recommend popping the hood to check the wiring around the fuel pump and cleaning the connectors if necessary. Remember, safety first—if the car won't start, seek help immediately to avoid getting stranded on the highway.
