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 components of the exhaust system), try to take advantage of the opportunity and 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 mechanical 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 Checking the condition and replacing the fuel flow sensor).
Steel tubes
Use only high-strength steel tubes from reputable manufacturers as replacement sections.
Remember that copper and aluminum tubes are not able to withstand vibration loads that occur during vehicle operation.
Remember that fuel lines on fuel injection equipped models must withstand high internal pressure.
Often, in branded stores of automobile accessories, you can buy sections of metal tubes equipped with threaded nipple attachments. 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 from the exhaust system components and no closer than 25 cm from the catalytic converter. Make sure that the fuel lines do not come into contact with the bodywork and suspension components. The minimum allowable clearance is 6.3 mm.
Replacement
1. Damaged sections of fuel lines (tubes or hoses) must be removed and replaced with new ones, of brand production.
2. Release the pressure in the fuel system (see section Relieving pressure in the fuel system).
3. Release the section of the fuel line to be removed from the intermediate fasteners securing it to the bottom of the vehicle.
4. If equipped, loosen the clamp(s) and disconnect the hose(s) from the metal line(s). If necessary, twist the hose on the fitting to loosen it to make it easier to disconnect.
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5. Installation is carried out in reverse order.