- always turn off the ignition before disconnecting or connecting the injection system or preheating device wires;
Fig. 470. Elements of the engine fuel system in the engine compartment: 1 - electromagnetic valve for enriching the fuel mixture during boost; 2 - EGR valve; 3 - electronic unit of the engine control system; 4 - injector with needle lift sensor; 5 - additional heating element relay; 6 - intake manifold temperature sensor; 7 - Needle lift sensor plug; 8 - Engine speed sensor plug connector; 9 - coolant temperature sensor; 10 - plug connector of the dispenser temperature sensor; 11 - plug connector of the fuel supply shut-off valve and injection start valve; 12 - fuel supply shut-off valve; 13 - fuel injection pump dispenser; 14 - mass air flow sensor
- sometimes the engine needs to be turned over with the starter (for example, when checking compression). To prevent the engine from starting, disconnect the connector of the fuel shut-off valve plug 12 (Fig. 470);
- disconnect the battery wires only when the ignition is off to avoid damaging the system;
- most of the components shown in Fig. 470 are electronic or electrical and must be handled with extreme care.
General precautions:
- all work on the injection system may only be carried out under the strictest conditions of cleanliness. Repair work on the injection system may only be carried out outdoors if there is no wind, to avoid dust getting into the injection system.
- before dismantling, thoroughly clean all parts and assemblies from dust;
- place the removed parts on a clean surface and cover them with paper or plastic. Do not use lint-free fabrics for this purpose;
- separate and remove any removed parts that will not be reinstalled;
- check the cleanliness of all installed parts;
- do not use compressed air to blow out other parts if fuel system connections are open;
- do not move the vehicle if any fuel system components are removed;
- do not allow diesel fuel to come into contact with the cooling system hoses. Clean the hoses immediately if this happens. Replace hoses contaminated with diesel fuel and damaged in this way. The injection pump cannot be repaired. Replace a faulty injection pump or send it to a service station for repair.
[The original can be found at: vwmanual.ru]
To adjust the injection time of the high-pressure fuel pump, as well as to remove and install it, you need to have a special tool. Adjustment of the high-pressure fuel pump can only be done at a service station using special equipment.
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