Attention. When carrying out any work with fuel. system, familiarize yourself with the rules for maintaining cleanliness and instructions. Strictly follow these rules and instructions before starting work and during it. In order to avoid running unfilled fuel. high pressure pump and to achieve a quick start of the engine after replacing parts, the following points must be taken into account. After removing or replacing parts/components between the tank and the fuel. a high pressure pump is necessary for purging fuel. system perform basic setup "Checking the fuel supply. pump". After removing or replacing additional fuel pump, fuel highways (between tank and fuel high pressure pump) or fuel filter, it is necessary to perform basic settings before starting the engine for the first time "Checking the fuel supply. pump" 1 time. After removing or replacing the fuel. high pressure pump, it is necessary to carry out basic settings before starting the engine for the first time "Checking the fuel supply. pump" 3 times. Carry out the first refueling after installing the high pressure pump.
System overview 1. Fuel metering valve -N290-: Do not open; 2. High pressure fuel pump: with fuel metering valve -N290-; after replacing the injection pump "necessary" perform the first refueling (to avoid dry running); 3. Fuel rail (high pressure energy accumulator): cylinder bank 1; 4. Fuel pressure control valve -N276-: on cylinder bank 1; disposable; 5. Fuel pressure sender -G247-: 30 Nm; on cylinder bank 2; 6. Fuel rail (High pressure energy accumulator): for cylinder bank 2; 7. Injectors (piezo injectors): injectors 1...6; 8. Drainage pipelines (return fuel highway): do not disassemble the fuel return lines - they must be replaced only together with the pressure reducing valve; After replacement, run the engine for approx. 2 minutes at idle to remove air from the fuel. system and then check the fuel return lines for leaks; 9. Reducing valve: The function of the reducing valve is to provide residual pressure in the return fuel. highways (volume of control) approx. 10 bar; this amount is necessary for the operation of piezo injectors; the pressure reducing valve must be replaced only in conjunction with the fuel return lines; After replacement, run the engine for approx. 2 minutes at idle to remove air from the fuel. systems; check the pressure relief valve; 10. Fuel cooler: installed on the bottom of the vehicle; 11. Fuel tank: with fuel pump. pump -G6-; 12. Heating valve; 13. Additional fuel. pump -V393-; 14. Fuel filter
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