Warning! Gasoline is highly flammable, so special precautions must be taken when working on any component of the fuel system.
Do not smoke, and do not approach the work area with an open flame or an uncovered carrier.
Do not carry out such work in garages equipped with natural gas heaters (such as water heaters, dryers, etc.). The work area must be well ventilated.
If gasoline comes in contact with your skin, wash it off immediately with soap and water.
Wear safety goggles and have 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 ignite spontaneously.
Examination
If you smell gasoline while driving or after the car has stood in the sun, you should immediately check the condition of the entire fuel system.
1. Remove the fuel tank cap and check it for damage and corrosion. The sealing insert on the cover must be intact. Replace cap if damaged or corroded.
2. Inspect the fuel system intake and return lines for cracks. Check that the connections between the fuel system lines and the fuel injection system and between the fuel system lines and the integrated fuel filter are not loose.
Attention! On vehicles equipped with a fuel injection system, the pressure in the system must be relieved before servicing the fuel hoses (see Section Safety precautions and cleanliness when working with the fuel system Chapters Power and exhaust systems).
3. Since some fuel system components - such as the fuel tank and some fuel system lines - are located at the bottom of the vehicle, they are easier to inspect when the vehicle is winched up. If this is not possible, jack up the vehicle and place it on jack stands.
4. With the vehicle raised, inspect the fuel tank and filler neck for holes, cracks, or other damage. Pay special attention to the condition of the connection between the filler neck and the tank. Sometimes fuel leaks occur due to loosening of the clamps securing the rubber neck or due to deterioration of the neck material. Inspect all brackets and straps for securing the fuel tank to make sure it is securely attached to the vehicle.
Warning! Never, under any circumstances, attempt to repair the fuel tank (excluding the replacement of its rubber components). The flame of a welding machine or any other open fire can easily lead to an explosion of gasoline vapors inside the tank. 5. Carefully inspect all fuel hoses and metal lines from the tank for loose connections, kinks, signs of wear on hose materials, or other damage. Repair or replace damaged sections as necessary.
Fuel filter replacement
Gasoline engines
Replacing the fuel filter on gasoline engines
51 - Clamp; 52 - Injection tube; 53 - Return tube; 55 - Fuel filter; 56 - Foil tape; 57 - latch; 58 - Bolt; 62 - O-rings; 69 - Lid
1. Open the fuel tank cap.
2. Disconnect the return (53) and injection (52) tubes.
3. Disconnect the injection tube (52) from the fuel filter.
4. Install a new filter with foil tape (56).
5. Start the engine and check for fuel leaks.
Diesel engine OM 603
Remove the fuel pre-filter. Install it with the arrow in the direction of fuel flow.
Diesel engine OM 606
Replacing the fuel filter on a 606 diesel engine
70/2 - Fuel filter
74 - Full bolt union connection
74/1 - Shut-off valve
76, 76/1 - O-rings
On some models, a full-flow filter with a separator can be installed in place of the fuel filter, which is distinguished by the absence of a drain plug at the bottom of the filter.
Removal of air from the diesel engine power supply system
If the engine has stopped due to the complete emptying of the fuel tank, then after refueling it is necessary to remove air from the fuel system. To do this, start the engine for no more than 60 seconds without interruption until it starts to run stably.