Warning! See warnings at the beginning of the Section Relieving pressure in the fuel system.
1. Before servicing the fuel lines or their fittings, it is necessary to relieve the pressure in the fuel system (see Section Relieving pressure in the fuel system).
2. The fuel lines of the fuel system are laid between the gas tank and the engine compartment. Steel tubes and flexible fuel hoses are attached to the bottom of the car with clamps and screw fasteners. Every time the car is raised above the ground for any purpose (for example, to inspect or replace exhaust system components), try to take the opportunity to check the condition of the fuel lines and their fittings. Carefully inspect all hoses and tubes of the fuel system for cracks, twists, deformations and other damage.
3. If signs of internal contamination or obstruction are detected, the corresponding section of the fuel line must be removed and blown out with compressed air. It is also mandatory to check the condition of the mesh filter of the fuel pump intake (see Section Removal and installation the fuel pump).
Steel tubes
1. Use only high-strength steel tubes from reputable manufacturers as replacement sections.
2. Remember that copper and aluminum tubes are not able to withstand vibration loads that occur during vehicle operation.
3. Remember that fuel lines on models equipped with injection systems must withstand high internal pressure.
4. Often, sections of metal tubes equipped with threaded nipples can be purchased in branded car accessory stores. When loosening and tightening nipple connections, use two wrenches to avoid turning the mating part of the connector. Be sure to check the condition of the sealing rings used to seal the nipple connections. Replace worn or mechanically damaged rings immediately. Try to use only branded parts as replacement components.
Flexible hoses
Caution: When replacing fuel hoses, use only original components designed for high internal pressure.
Flexible fuel hoses must be installed no closer than 10 cm (4 in) from exhaust system components and no closer than 25 cm (10 in) from the catalytic converter. Make sure that the fuel lines do not come into contact with body parts or suspension components. The minimum permissible clearance is 6.3 mm (0.24 in).
Removal and installation
1. Release the pressure in the fuel system (see Section Relieving pressure in the fuel system).
2. Release the section of the fuel line to be removed from the intermediate fasteners securing it to the vehicle underbody. Note: Quick-connect fittings are not subject to repair and if they fail, the corresponding section of the line must be replaced as a whole.
3. Installation is carried out in the reverse order. Do not forget to replace the sealing rings of the threaded nipple connections. Before snapping the quick-connect connectors, make sure that the dogs of the locking tongues are correctly aligned with the corresponding grooves.
Repair
Damaged sections of fuel lines (tubes or hoses) must be removed and replaced with new, original parts.
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