The harm of water content in fuel to the high pressure common rail system of heavy duty trucks

Many regions overseas have uneven storage and transportation environments for diesel fuel, and the phenomenon of oil-water mixing is common. Most heavy-duty truck drivers only focus on whether the diesel is sufficient and ignore the issue of water content in the fuel. They believe that a small amount of water will not affect the use of the vehicle. In fact, modern heavy-duty truck high-pressure common rail systems have extremely high precision and strict requirements for oil purity. Once the fuel contains water for a long time, it will cause irreversible damage to core precision components such as high-pressure fuel pumps, fuel injectors, and common rail pipes, leading to insufficient power, shaking, frequent shutdowns, and significantly increasing maintenance costs. This is the hidden culprit of premature aging of many fleet vehicles. Firstly, the water content in the fuel will directly damage the lubrication effect of the high-pressure fuel pump. The high-pressure common rail fuel pump relies on diesel to complete lubrication and cooling. The precision plunger and sleeve gap in the high-pressure Long term operation can cause oil film rupture, resulting in dry wear and tear on the inner wall of the plunger, increased pressure relief gap, slow establishment of oil pump pressure, unstable idling, and difficulty in starting. This directly leads to the scrapping of the high-pressure oil pump. The repair cost is extremely high. Secondly, the fuel injector is the most easily damaged precision component, and the diesel atomization performance is extremely poor. Moisture cannot be fully burned, which can cause carbon buildup in the nozzle hole, blockage of the needle valve, uneven fuel injection, and poor oil atomization. The vehicle is characterized by idle shaking, difficult cold start, weak power during heavy load climbing, weak ability to climb uphill, and white smoke emission from exhaust gas. Long term operation with water content can cause the fuel injector to rust and get stuck, completely losing its fuel injection function. It can only be replaced as a whole, seriously affecting the vehicle's attendance rate. Thirdly, moisture entering the common rail system can cause oil Long term sensitivity to moisture Soaking can cause oxidation and corrosion of the inner wall, resulting in the production of metal debris and debris. The internal oil circuit is continuously worn, and precision components can also block small oil passages, causing excessive fluctuations in rail pressure. The engine frequently reports fault codes, torque limits, speed limits, and frequent shutdowns, which affect the normal operation of mainline transportationThe fourth issue is that the water content in the fuel will exacerbate internal wear and carbon accumulation in the engine, increasing the amount of water involved in combustion and significantly reducing the combustion temperature in the cylinder. Insufficient combustion will produce a large amount of gum and carbon deposits at the top of the piston intake valve position, causing a decrease in engine compression ratio and an increase in fuel consumption. At the same time, the water content in the fuel tank can cause corrosion of the cylinder liner and piston, exacerbating mechanical wear and shortening the overall service life of the engine. The fifth issue is that the water accumulation in the fuel tank can easily breed impurities and cause secondary pollution of the oil circuit. Overseas construction sites store oil tanks outdoors, with large temperature differences between day and night, which can easily produce condensation water. Long term non drainage can cause water accumulation at the bottom of the fuel tank, repeatedly circulating and polluting the oil circuit. Even if the filter element is To protect the high-pressure common rail system, it is necessary to regularly check the accumulated water in the fuel tank and replace the qualified oil-water separator filter element to avoid storing low-quality diesel. Regular drainage and maintenance should be carried out to eliminate the problem of oil-water mixing from the source. The water content in the fuel is a gradual damage, and the initial symptoms are not obvious. Once shaking, power difference, and wear occur, most common rail components have already caused permanent wear. Overseas heavy-duty truck fleets want to reduce the failure rate of high-end precision parts and reduce high maintenance costs. It is necessary to pay attention to the quality of diesel oil and do a good job in oil-water separation and maintenance to