Relieve pressure in the fuel system.
The metal fuel lines are routed underneath the car and secured with clamps and self-tapping screws. Inspect them periodically for leaks and damage.
If there is dirt in the fuel filter and fuel lines when replacing it, be sure to disconnect the lines and blow them out with compressed air. Also check the condition of the mesh filter on the fuel pump unit.
Never use copper or aluminum tubes to replace the steel tubes installed on the vehicle, as they may not withstand the vibrations experienced during vehicle operation.
Since fuel lines are under high pressure, they require special maintenance.
Some fuel pipes have threaded connections with O-rings that must be loosened before servicing or replacing components. These connections use cone nuts that, when tightened, additionally compress the connection. Inspect the O-rings for cracks or damage and replace if necessary. If replacing steel pipes, install only original pipes.
Flexible fuel hoses must be located at least 100 mm from the exhaust system components and 250 mm from the catalytic converter.
Some models are equipped with nylon fuel hoses with quick-release connectors. In this case, when it is necessary to replace one hose, replace the hoses with quick-release connectors.
Replace fuel pipes/hoses as follows.
Relieve pressure in the fuel system.
Release all clamps securing the tube/hose to the vehicle body.
On normal steel fuel line and hose connections, loosen the clamp, then pull the line out of the hose. Twisting the line and hose back and forth makes the disconnection process easier.
Fig. 5.3. Opening the clamp (1) of the quick-release connector
Fig. 5.4. Pressing the latches and removing the tube from the quick-release connector
If the hoses are connected using a quick-release connector, open and remove the clamp, then press the clamps on both sides with one hand and pull the tube out of the connector with the other hand (fig. 5.3, 5.4).
When connecting tubes and hoses, be sure to install new sealing rings (if provided by design).
On quick release connectors, align the tube with the connector and insert the tube into the connector until it snaps into place.
Fig. 5.5. Typical hose connection to steel tube: 1 – steel tube; 2 – hose; 3 – clamp
For a normal connection of a hose to a steel tube, slide the hose onto the tube and secure the connection with a clamp (Fig. 5.5).