Caterpillar 5I-8043 Fuel Injection Pipe Assembly

The Caterpillar 5I-8043 fuel injection pipe serves as a critical return line component within the high-pressure fuel system of 3306 series diesel engines. Manufactured to OEM specifications, this rigid tube conveys fuel under elevated pressure and temperature conditions between injection system components. Constructed from high-grade steel tubing with corrosion-resistant surface treatment, the pipe maintains dimensional stability under cyclic thermal loading and vibration typical in excavator applications. The assembly includes precision-formed bends and flared or threaded end connections to ensure leak-free sealing at injector and pump interfaces. Direct replacement for Caterpillar part numbers 5I-8043, 5I8043, and CA5I8043. Validated for compatibility with 3306 engines installed in 320B, 320C, 321B, and E200B hydraulic excavator platforms.