2. Abrasive particles, in addition to the danger of fuel filter obstruction and clogging of fuel tracts, lead to wear of the injection system elements, respectively, to a decrease in the power developed by the engine, and, as a result, to failure of the high-pressure fuel pump and injectors.
3. Water appears in the fuel system as a result of refueling low-quality fuel, as well as as a result of condensation of moisture present in the atmospheric air. In addition to the development of corrosion on the metal components of the fuel system, water ingress into the engine cylinders is a particular danger. Diesel engines have a very high compression ratio, while water is a practically incompressible physical substance - even a small amount of water entering the cylinders of a running engine can lead to engine failure as a result of water hammer. It is necessary to drain the water / sediment from the fuel filter in a timely manner (see Chapter 1, Section 8).
Note: Diesel storage tanks (including both large tanks and vehicle fuel tanks) are more susceptible to moisture formation than gasoline storage containers, since the vapor pressure of the latter is noticeably higher. To minimize the ingress of condensate into the fuel, try to keep the tank full at all times and avoid long periods of vehicle downtime.
4. If small particles of dirt or natural watering of the fuel get in, it is sufficient to perform maintenance work in a timely manner. In the event of heavy contamination of the fuel system as a result of any special circumstances (dropped a piece of rags into the tank, filled a full tank with very poor quality fuel, strong corrosion development, untimely transition to winter fuel, and as a result - paraffin in the fuel paths, etc.) a complete cleaning of the system is required.
5. Completely empty and remove the fuel tank (see Section 10). Note: Drained fuel must not be reused. Wash the tank thoroughly, flush the inside with clean diesel/gasoline. Highlighting yourself with a flashlight, make sure that the inner walls of the tank are absolutely clean. If it is not possible to completely remove all deposits by washing, resort to steam cleaning.
6. If paraffin is formed in the diesel fuel, disconnect the fuel supply and return lines, remove the fuel filter and flush the fuel lines with clean fuel.
7. Replace the fuel filter, reinstall the tank, reconnect the fuel lines to the original, and fill the tank with clean diesel fuel. Remove air from the system (see Section 4). At the first stage of vehicle operation, make sure that the power supply system is fully restored.
8. If there is a suspicion that the injection pump is dirty, it must also be thoroughly cleaned. Do not attempt to independently carry out this procedure - entrust its implementation to car service specialists.
9. Special additives are always available from car accessories stores to prevent micro-organisms and water condensation - check with Opel officials about which additives are approved for use on a particular vehicle. Manufacturers of high-quality fuels themselves add this kind of additives to diesel fuel.
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