The fuel hose of a vehicle, serving as the “lifeline” connecting the engine and the fuel tank, has its oil resistance directly linked to the vehicle’s normal operation and lifespan. However, over time and with the deterioration of the environment, the oil resistance of the hose may decrease, leading to issues such as oil leakage. So, how to improve the oil resistance of auto fuel hose? This article will provide a detailed explanation from aspects such as hose material, usage environment, and maintenance.

3 ways to improve the oil resistance of auto fuel hose

1.The Importance of Hose Material

The oil resistance of a fuel hose largely depends on its material. Currently, the common materials used for automotive fuel hoses are rubber, plastic, and metal.

• Rubber Hoses: Rubber hoses are commonly used, offering good flexibility and oil resistance. However, the oil resistance varies among different types of rubber; for example, Nitrile Rubber (NBR) has better oil resistance, making it suitable for petroleum products like gasoline and diesel.
• Plastic Hoses: The oil resistance of plastic hoses depends on the type of plastic used. For instance, Polytetrafluoroethylene (PTFE) has excellent chemical resistance, including to various oils.
• Metal Hoses: Metal hoses are usually used in high-pressure oil lines, offering advantages such as high-temperature and pressure resistance, though they lack flexibility.
  Choosing a hose material with good oil resistance is the first step to improving the oil resistance of the fuel hose.

2.Structural Design: Enhancing Hose Durability

The structural design of the hose directly affects its oil resistance and durability. A well-designed structure can effectively reduce stress concentration during use, preventing oil leakage and aging problems.

• Multilayer Structure Design: A multilayer structure is an effective way to improve the oil resistance of the hose. By adding one or more oil-resistant layers to the hose, corrosion from oil can be effectively blocked. For example, using PTFE material in the inner layer, a heat-resistant fluororubber in the middle layer, and materials with UV and aging resistance in the outer layer can significantly enhance the hose’s oil resistance and lifespan.
• Inner Lining Design: Adding an inner lining to the inside of the hose can further improve its oil resistance. This lining is typically made from materials with excellent oil resistance, such as PTFE or fluororubber, which effectively isolates the oil from the outer materials, reducing the risk of corrosion and aging. Additionally, the inner lining can improve the hose’s flow characteristics, reducing pressure loss.
• Reinforcement Design: For hoses that need to withstand high pressure, reinforcement design is essential. By incorporating braided layers or spiral steel wires into the hose, its pressure resistance can be enhanced, preventing expansion or rupture under high pressure. This reinforcement design not only improves the hose’s durability but also increases its safety.

3.Production Process Improvement: Enhancing Performance Through Process

In the production of fuel hoses, process improvements play a crucial role in enhancing their oil resistance.

• Vulcanization Process Optimization: Vulcanization is a key step in hose production that directly affects its oil resistance and mechanical properties. Optimizing vulcanization temperature, time, and pressure can improve the crosslinking density of the hose, enhancing its oil resistance and durability.
• Surface Treatment: During the production process, surface treatment techniques such as plasma treatment or chemical treatment can be used to enhance the adhesion of the material surface, thereby improving the hose’s oil resistance. Moreover, surface treatment can also enhance the hose’s wear resistance and anti-aging properties.
• Inner Wall Coating Technology: To further enhance the oil resistance of the hose, an oil-resistant coating can be applied to its inner wall. This coating, typically made from polymers with excellent oil resistance, can effectively prevent erosion from fuel, extending the hose’s service life.

Impact of Usage Environment on Hose Oil Resistance

• Temperature: High temperatures can accelerate the aging of the hose, reducing its oil resistance. Therefore, it is advisable to avoid exposing the hose to high-temperature environments for extended periods.
• Fuel Type: Different types of fuel have varying levels of corrosiveness on the hose. For instance, fuel with high sulfur content can accelerate the aging of rubber hoses.
• Chemical Substances: Exposure to other chemical substances can also affect the oil resistance of the hose.

Maintenance of Fuel Hoses

• Regular Inspection: Regularly check the hose for cracks, aging, wear, and other signs, and replace damaged hoses promptly.
• Avoid Overbending: Excessive bending can accelerate the aging of the hose, shortening its service life.
• Keep Clean: Regularly clean the area around the hose to prevent dirt from causing wear on the hose.
• Use Appropriate Additives: Suitable hose protectants can be used to improve the oil resistance and service life of the hose.

How to Choose a Fuel Hose with Good Oil Resistance

• Review the Product Manual: Hoses produced by reputable manufacturers come with detailed product manuals that specify the hose’s material, temperature range, pressure range, and other parameters.
• Consult Professionals: You can seek advice from automotive technicians or auto parts salespeople.
• Choose Well-known Brands: The quality of hoses from well-known brands is relatively more reliable.

Conclusion

Improving the oil resistance of automotive fuel hoses is a systematic task that requires consideration of material selection, usage environment, maintenance, and more. By choosing the right materials, using the hoses correctly, and maintaining them regularly, you can effectively extend the hose’s service life and ensure the normal operation of the vehicle.