With what must supply and return lines be connected?

Supply and return lines in the context of oil fuel systems are typically connected using flare fittings. These fittings create a strong, leak-proof seal at the joint, which is essential for maintaining system integrity and safety. Flare fittings involve a cone-shaped interface that allows for a tight mechanical connection when tightened. This design is particularly effective for high-pressure applications, which are common in fuel systems, and provides reliability under varying temperatures and pressures.

While other types of connections such as compression fittings and welded joints may be used in different applications, flare fittings are preferred in oil fuel systems due to their ease of assembly and disassembly, resilience to vibration, and effectiveness in preventing leaks. The sealing performance of flare fittings makes them highly suitable for handling the flow of oil and maintaining the efficiency of the system.