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Exhaust system > < Injectors

Leon Mk1

System layout
System layout
  WARNING
t  Always read rules for cleanliness and instructions for working on fuel system → Chapter.
t  Always follow these rules for cleanliness and instructions before starting work and while working on the fuel system.
t  If components of the fuel system between the tank and the high-pressure fuel pump are removed or renewed, the fuel system must be filled to be bled → Chapter. (It is important not to allow the high-pressure pump to run while still empty.)
  Note
If the first filling is not performed, damage will be caused to the high-pressure fuel pump.
   
1 - High-pressure fuel pump
q   After the replacement, first fuel „must“be filled (dry running is to be avoided at all costs) → Chapter
q   removing and fitting → Chapter
2 - Fuel metering valve -N290-
q   Do not open.
3 - Fuel pressure sender -G247-
q   100 Nm
q   removing and fitting → Chapter
4 - Fuel rail
5 - Fuel pressure regulating valve -N276-
q   80 Nm
q   Cannot be re-installed.
q   removing and fitting → Chapter
6 - Injectors (piezo injectors)
q   removing and fitting → Chapter
7 - Fuel return lines
q   The fuel return lines must not be dismantled; if necessary they must be renewed complete with pressure retention valve.
q   After replacement, the engine must be run at idling speed for approx. 2 minutes to bleed the fuel system. Then check the fuel return lines for leaks.
8 - Pressure retention valve
q   The pressure retention valve maintains a residual pressure (for control purposes) of 0.3 ... 1.2 bar in the fuel return lines.
q   This residual pressure is required for the control function of the injectors.
q   The pressure retention valve may only be renewed together with the fuel return lines.
q   After replacement, engine must be run at idling speed for approx. 2 minutes to bleed fuel system.
9 - Fuel tank
q   With fuel system pressurisation pump -G6-.
10 - Connecting pipe
11 - Fuel filter
q   Fuel filter: Components overview → Chapter
q   Renew fuel filter → Booklet601.

   

Exhaust system > < Injectors