The diagram shows the flow of fuel in a diesel injection system From the tank (7) fuel through the supply pipeline (8) enters the fuel filter (1) The purified diesel fuel is then sucked in by the fuel pump (2) Excess fuel moves back through a thin hole (3) into the drain pipe (4). Under high pressure through pipelines (6) fuel is supplied to the injectors (5). A small amount of fuel from the injector flows back into the tank through the drain line.
The diagram shows the fuel lines and their location From the fuel tank, the supply pipe runs along the bottom of the machine to the fuel filter in the engine compartment. The flowing diesel fuel is cleaned in the filter and sucked in by the high-pressure fuel pump. The latter injects a certain amount of fuel through the injectors. But not all fuel will be supplied to the injectors. Excess fuel gets into the drain pipe, which then returns to the top beer tank
The high-pressure fuel pump pumps fuel at a pressure of 120 to 130 bar through high-pressure pipelines to four nozzles. The injectors also do not inject all the fuel supplied. The drain pipeline is common for four nozzles. From one of the external nozzles (depends on this model) excess fuel is returned to the fuel tank through a drain pipe common with the injection pump.
On the extreme nozzle, a rubber cap is put on one of the flanges of the drain pipe.
Shown here is an injector mounted on the engine: 1 - high pressure fuel line; 2 - rubber cap on the free fitting of the drain fuel line, only near the left nozzle, when viewed in the direction of travel; 3 - drain pipeline; 4 - nozzle.
Instruction. The black rubber cap mentioned in the previous text (see fig.) on the last nozzle it may not be tight; as a result - fuel leakage and malfunctions in the engine. Check to see if fuel leaks when the engine is running. If yes, the defective cap should be foamed.
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