Before beginning service on the fuel lines or their fittings, always relieve system fuel pressure. The fuel supply, return, and Evaporative Emission Control (EVAP) lines run between the fuel tank and engine compartment. The fuel supply lines are made of steel or rubber, the return hoses are made of rubber and EVAP lines are made of plastic. They are held to the underbody by clips and brackets. Whenever the vehicle is elevated for service, check these lines for leaks, kinks and dents. In the event that dirt is found in the fuel system or fuel filter, disconnect the affected line and blow it out. Check the fuel inlet strainer on the
Fuel Pump for blockage or contamination. Several types of quick-connect fittings, such as one-tab and two-tab retainers as well as plastic retainer rings, join fuel lines and components. If there is damage or leakage, replace the entire fuel line or quick connect fitting assembly with original equipment parts or those that meet original specifications. To disassemble, relieve system fuel pressure, remove fasteners, clean area surrounding fitting, and pull fittings apart while depressing retaining tabs. At assembly, the male part of the fitting should be clean and lightly lubricated. The retaining tabs must be aligned with the windows in the female fitting. Finally, try to pull the lines apart ensuring that they are still secure. The disassembly and assembly process for plastic retainer ring fitting is similar to that of metal retainer rings. Ensure the retainer ring is properly engaged. If it is necessary to replace a metal line, the quick-connect fittings should be disassembled and the line removed. If acceptable, a new piece of steel tubing can be spliced in. For plastic lines, if damaged, the whole assembly must be replaced, and for rubber hoses, simply loosen the clamps and remove the hose to install a new one, ensuring to pressurize the system and check for leaks after each replacement.