Annually or every 20,000 km.
Gasoline is highly flammable, so special precautions should be taken when working with any fuel system components. Do not smoke or approach the work area with an open flame or unprotected portable lamp. Do not perform such work in garages equipped with heating appliances that run on natural gas (such as water heaters, dryers, etc.). The work area must be well ventilated. If gasoline comes into contact with your skin, wash it off immediately with soap and water. Wear safety glasses and keep a fire extinguisher handy when doing any work on the fuel system. If gasoline spills, wipe up the puddle immediately, but do not keep gasoline-soaked rags in places where they can spontaneously ignite.
1. If you smell gasoline while driving or after the car has been standing in the sun, you must immediately check the condition of the entire fuel system.
2. Remove the fuel tank cap and check it for damage and corrosion. The sealing insert on the cap should be intact. If there is damage or corrosion, replace the cap.
3. Inspect the fuel system inlet and return lines for cracks. Make sure that the connections between the fuel system lines and the carburetor or fuel injection system, and between the fuel system lines and the in-line fuel filter are not loose.
On vehicles equipped with fuel injection, the system pressure must be relieved before servicing the fuel hoses. For instructions, refer to Chapter Power supply system.
4. Since some fuel system components - such as the fuel tank and some fuel system lines - are located underneath the vehicle, they are easier to inspect when the vehicle is jacked up. If this is not possible, jack up the vehicle and support it on axle stands.
5. With the vehicle raised, inspect the fuel tank and filler neck for holes, cracks, or other damage. Pay particular attention to the condition of the connection between the filler neck and the tank. Sometimes fuel leaks occur due to loose rubber neck clamps or damage to the neck material. Inspect all fuel tank mounting brackets and straps to ensure that the tank is securely fastened to the vehicle.
Never, under any circumstances, attempt to repair the fuel tank (excluding the replacement of its rubber components). A welding flame or any other open flame can easily cause the gasoline vapor inside the tank to explode.
6. Carefully inspect all fuel hoses and metal lines coming from the tank for loose connections, twists, signs of wear on hose materials and other damage. Repair or replace damaged sections as necessary (see chapter Power supply system).