What Causes the Engine to Be Noisy After Refueling?
4 Answers
Car engine becomes noisy after refueling due to the following reasons: 1. Oil issue: The engine oil has not fully lubricated all components of the engine. It takes some time for the new oil to evenly lubricate all parts of the engine. 2. Severe wear: It could also be due to severe wear, and if the engine internals are cleaned, the gaps from wear may become larger. If maintenance is neglected, it might be caused by excessive carbon buildup in the engine (such as excessive carbon in the engine, throttle, spark plugs, etc.), which can be resolved by cleaning at a repair shop. 3. Exhaust pipe leak: When there is a leak in the intake or exhaust pipe, the vehicle produces a louder roar as the exhaust rate increases with acceleration.
I've experienced the engine getting louder after refueling several times, usually due to poor fuel quality with excessive impurities causing incomplete combustion. My car is an older family sedan, and every time I fill up with cheap gas from small stations, problems arise - the engine noise increases and sometimes comes with vibrations. The repair shop checked it and said the fuel system was adapting to the new fuel, possibly with unstable fuel pump pressure or spark plug carbon buildup exacerbating the noise. They recommended switching to reputable gas stations and avoiding cheap options, suggesting the noise might normalize after running through one or two tanks. If the noise persists, it's best to have a mechanic thoroughly inspect the fuel system and ignition system to prevent engine damage. For safety, I now always verify the fuel grade label before refueling, and this issue has basically stopped occurring.
I've thought about the reason why my family car's engine becomes too noisy after refueling, and the core issue lies in the imbalance of the fuel system during instantaneous adjustments. For example, if the newly added fuel has an inappropriate octane rating, it can cause an unbalanced air-fuel ratio, leading to incomplete combustion in the engine, which naturally makes the noise louder. I've compared different gas stations and found that major brands have fewer issues, while smaller stations occasionally mix in impurities, making the pistons prone to knocking during operation. Another factor is the aging of the fuel pump or sensors, which is more common in older cars. The solution is to observe for a few days first; if the noise lessens, it's fine. If it worsens, check the oxygen sensor or throttle to ensure the fuel system is unobstructed. After changing the fuel, drive at a steady speed for a while to help the system adapt. In short, choosing good fuel is key, and I make it a habit to clean the fuel injectors regularly to avoid deposits.
After refueling, the engine is running loudly, and I suspect the issue lies with poor fuel quality or the engine recalibrating. For instance, using higher-octane fuel than required may cause abnormal combustion, resulting in harsh noises resembling roaring. Common triggers include significant fuel pump pressure fluctuations or brief malfunctions in the electronic fuel injection system. It's advisable to drive at highway speeds to allow the system to stabilize, which should reduce the noise. If the abnormal sound persists, it's best to have the spark plugs and air filter checked at a service center. For daily refueling, choose reputable gas stations and avoid frequently switching fuel brands.
