Automobile fuel position sensor is usually composed of the following materials:

1. Stainless steel: Stainless steel is a commonly used material, which is used for the shell of sensors, floats and other parts. Stainless steel has the advantages of corrosion resistance, high temperature resistance and high strength, which can effectively protect the internal components of the sensor from the external environment.

2. Polyamide: Polyamide is a kind of high-performance engineering plastic, which is often used in sensor housings and connecting wires. Polyamide has excellent mechanical properties, wear resistance and high temperature resistance, and is suitable for the manufacture of automobile sensors.

3. Polyurethane: Polyurethane is a kind of material with excellent wear resistance and corrosion resistance, which is often used as the seal and waterproof parts of sensors. Polyurethane can effectively prevent water vapor and dust from entering the sensor and protect the normal work of sensor elements.

4. Silica gel: Silica gel is a kind of soft, high-temperature resistant and corrosion-resistant material, which is often used in the sealing ring and waterproof parts of sensors. Silica gel has good sealing performance, which can effectively prevent liquid and gas from infiltrating into the sensor and protect the sensor elements from being damaged.

5. Aluminum alloy: Aluminum alloy is often used as the bracket and fixing part of sensors. Aluminum alloy has the advantages of light weight, high strength and corrosion resistance, which can provide stable support and fixation to ensure the stability and reliability of the sensor during vehicle operation.

To sum up, the materials of automobile fuel position sensor mainly include stainless steel, polyamide, polyurethane, silica gel and aluminum alloy. These materials have their own characteristics and advantages, which can effectively protect the internal components of the sensor and ensure its normal operation and stability. When selecting and designing sensor materials, it is necessary to consider the performance requirements, use environment and cost of the materials to ensure the quality and reliability of the sensor.