What Causes Fuel Injector Leakage?
2 Answers
The causes of fuel injector leakage include dirty engine oil, poor cooling of the injector due to high engine temperature, wear of the fuel outlet valve, missing or damaged gaskets during injector installation, and excessively low injection pressure. Symptoms of fuel injector leakage: Engine idle shaking, excessive fuel dripping into the cylinder causing rich air-fuel mixture, difficulty in engine starting, increased engine noise, unresponsive throttle, uneven acceleration, black smoke from the exhaust pipe, and accelerated wear of piston rings. Solutions for fuel injector leakage: Check all components of the engine lubrication system for external leaks. Replace oil seals immediately if they are aged, cracked, or leaking.
I've encountered fuel injector leaks several times, usually caused by aging or damaged sealing rings. Long-term exposure to high temperature and pressure environments can make rubber components brittle and cracked, leading to fuel leakage. If the injector isn't tightened properly during installation or the sealing ring is of poor quality, leaks are also likely to occur. Low-quality gasoline is another hidden danger, as impurities can accumulate around the injector and corrode the seals. What's worse, fuel leaks not only waste gasoline and increase fuel consumption but may also drip onto the engine and cause a fire, which is extremely dangerous. I recommend starting with the simplest solution: inspect and replace the sealing rings, which often resolves the issue. If the leak persists, check if the fuel pressure system is causing abnormally high pressure or if the entire injector valve core is worn out and needs replacement. Regular maintenance and using high-quality fuel can prevent this problem. Don't wait until it becomes serious—pay attention to signs like unusual gasoline odors or sudden increases in fuel consumption.
