Attention! See the warnings at the beginning Depressurizing the supply system.
1. Before servicing the fuel lines or their fittings, it is necessary to relieve the pressure in the fuel system (see Depressurizing the supply system).
2. The lines of the fuel path of the power supply system are laid between the gas tank and the engine compartment. Steel tubes and flexible fuel hoses are attached to the underbody of the vehicle with clips and screw fasteners. Every time the vehicle is lifted off the ground for any purpose (e.g. 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 fuel line hoses and tubes for cracks, twists, deformations, or other damage.
3. If signs of internal contamination or obstruction are detected, the corresponding section of the fuel path must be removed and blown with compressed air. Be sure to also check the condition of the fuel flow sensor strainer (see Removal and installation of the fuel pump).
Steel tubes
1. Use only high-strength steel tubing from reputable manufacturers as replacement sections.
2. Remember that copper and aluminum tubes are not able to withstand the vibration loads that occur during the operation of the car.
3. Do not forget that the fuel lines on models equipped with an injection system must withstand high internal pressure.
4. It is often possible to purchase sections of metal tubes equipped with threaded nipple nozzles in branded automotive accessory stores. Use two wrenches when loosening and tightening bar connections to avoid turning the mating connector. Be sure to check the condition of the O-rings used for sealing the nipple connections. Replace worn or mechanically damaged rings immediately. Try to use only branded parts as replacement components.
Flexible hoses
Attention! When replacing fuel hoses, use only genuine high pressure parts.
1. Flexible fuel hoses must be laid no closer than 10 cm from the components of the exhaust system and no closer than 25 cm from the catalytic converter. Keep fuel lines away from bodywork and suspension components (see accompanying illustration). The minimum allowable gap is 6.3 mm.
Removal and installation
1. Relieve the pressure in the supply system (see Depressurizing the supply system).
2. Release the section of the fuel path to be dismantled from the intermediate clamps securing it to the bottom of the vehicle.
3. Release collars of fastening of rubber hoses to steel tubes of a fuel path. To disconnect the hose, rotate it on the tube.
4a. Installation is in the reverse order. Don't forget to replace the O-rings on the threaded fittings.
4b. The sealing washers of the hollow bolt of the fitting assembly on the fuel filter must also be replaced without fail (see accompanying illustrations).
Repair
Damaged sections of fuel lines (pipes or hoses) must be removed and replaced with brand new ones.