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The fuel return line is responsible for returning excess fuel back to the fuel tank, ensuring that the fuel pressure within the fuel system remains stable and preventing fuel overflow. A clogged or damaged fuel return line can lead to increased fuel pressure, poor engine performance, and potential fuel leaks. Regularly inspect the fuel return line for signs of wear, damage, or blockage, and clean or replace it as needed according to your vehicle’s maintenance schedule, typically every 60,000 to 100,000 miles. Maintaining a healthy fuel return line ensures efficient fuel pressure regulation, enhances engine performance, and prevents fuel-related issues such as leaks and overflows.