General domestic passenger cars are usually gasoline engines, and the fuel filled in the fuel tank is gasoline. The only difference is that different models have different gasoline labels. The gasoline designation represents the ratio of the antiknock resistance of actual gasoline to that of standard gasoline. The higher the label, the stronger the anti-knock performance. Of course, for a certain car, the higher the gasoline grade, the better, because the compression ratio of the engine is different, and the suitable gasoline grade is also different. The wrong gasoline label will still have an impact on the vehicle, not to mention adding diesel to the gasoline engine by mistake. What should I do if I add diesel to a gasoline car by mistake?
What is the difference between petrol and diesel
First, let's understand the difference between gasoline and diesel. The carbon content of gasoline is lower than that of diesel, and its density is also lower than that of diesel; the ignition point of gasoline is higher than that of diesel, and it is more volatile than diesel. Because the characteristics of the fuel are different, the ignition method in the internal combustion engine is also different: diesel has a low auto-ignition point, so the diesel engine uses a compression ignition method to ignite, unlike gasoline engines, it does not require additional spark plugs to ignite , the temperature can be raised to the ignition point of diesel only by compressed air, and then it can be burned by injecting diesel; and gasoline has a high self-ignition point and is volatile. mixture of gases to burn.
What happens if you add diesel by mistake
What happens if diesel is mistakenly added to a gasoline engine? Because gasoline is volatile, the pressure of the fuel injection nozzle of the gasoline engine is lower than that of the fuel injection nozzle of the diesel engine. Under the lower pressure, the diesel oil cannot be completely atomized, but enters in the form of partial atomization and partial liquid state. In the cylinder block, the fuel cannot be fully burned, and it is easy to form carbon deposits and block the fuel injection nozzles.
Before the spark plug in the cylinder is ignited, the mixture of atomized diesel and air reaches the self-ignition temperature before the compression process is completed, and starts to burn violently, causing abnormal pressure in the combustion chamber, that is, "knock", causing damage to the engine.
If the gasoline engine is wrongly filled with diesel, the vehicle will not start in many cases. Because the diesel itself is not volatile, it is difficult to form a sufficient concentration of mixed gas with the air, so that it cannot be ignited and the engine cannot be started. If it is lit, the driver will also feel that the car has insufficient power during driving. No matter how much you step on the accelerator, the power will not go up. After all, the fuel cannot be fully burned to provide power, the body will shake, and the exhaust pipe will emit thick black smoke. Moreover, the knocking generated by the pre-combustion in the combustion chamber will produce a huge impact, which will not only damage the entire oil circuit system, but may even damage the engine.
How to deal with wrongly adding diesel
If you find that the wrong fuel is added immediately after refueling, you should call a tow truck to the repair shop to drain the wrongly added diesel oil and refill the gasoline. If you find out after driving for a certain distance that you may have added diesel fuel by mistake, you should immediately pull over to the side and turn off the engine, call the rescue and tow the vehicle to a professional repair shop for processing, clean the fuel tank, fuel injector, fuel circuit, etc., and replace the gasoline filter element And so on, try to recover the loss.
Misfuelling is not a trivial matter, it is related to the normal operation of the engine, even at the gas station, it may be caused by inadvertent fueling. If you don't find the problem at the first time, once you notice something strange in the follow-up driving, you should immediately turn off the engine and call a tow truck to a professional maintenance point for processing.