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Inspecting tandem pump (Superb II, Octavia II, Fabia II, Roomster) > < Removing and installing suction jet pump (Superb II, Octavia II)

Octavia Mk2

Removing and installing the tandem pump (Superb II, Octavia II, Fabia II, Roomster)
Removing and installing the tandem pump (Superb II, Octavia II, Fabia II, Roomster)
Special tools and workshop equipment required
t  Hand vacuum pump, e.g. -VAS 6213- or VAS 5226
t  Pliers for spring strap clamps
  WARNING
The tandem pump must not be disassembled, otherwise the proper operation of the pump vacuum part is no longer assured. This will result in a failure of the brake booster.
  Caution
Observe instructions for re-installing a used tandem pump → Anchor.
Conditions
l  Ignition is switched off and ignition key is withdrawn.
Removing
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe the regulations concerning cleanliness when working on the fuel supply/injection system → Chapter.
   
–  Separate feed hose -1- (marked in white) and return-flow hose -2- (marked in blue) from the fuel filter.
–  Connect hand vacuum pump with ventilation reservoir (e.g. -VAS 6213-) to return-flow hose -2-.
–  Generate vacuum with hand vacuum pump until there is no more fuel from the return-flow pipe. Ensure that no fuel is drawn into the hand vacuum pump.
  S20-0283
–  Unplug connector -2- from the air mass meter -G70-.
–  Disconnect ventilation hose -1- and air guide hoses -3- and -5-.
–  Release screw -4- and remove air filter.
  S10-0304
–  Separate vacuum line -1- for brake servo unit from tandem pump -4-.
–  Pull out the central plug for the unit injectors.
–  Separate feed hose -2- (marked in white) and return-flow hose -3- (marked in blue) on the tandem pump -4-.
–  Unscrew securing bolts -arrows-.
–  Remove tandem pump -4- from cylinder head.
Install
Installation is performed in the reverse order, pay attention to the following points:
  Note
t  Ensure the tandem pump coupling is correctly inserted into the camshaft.
t  Always replace the tandem pump seals.
  S20-0187
–  Connect return-flow hose -3- (marked in blue) to the return-flow coupling of the tandem pump.
–  Install tandem pump and tighten the top fixing screws M8 to 20 Nm.
–  Tighten M6 fixing screws to 8 Nm.
–  Connect the feed hose -2- (marked in white) to the feed connection and the vacuum line -1- of the brake servo unit to the tandem pump -4-.
–  Connect central plug for unit injectors.
–  Install charge air pipe and air filter.
  S20-0187
–  Connect the hand vacuum pump with the bleeder bottle (e.g. -VAS 6213-) to the return-flow hose -2- (blue marking) of the fuel filter.
–  Generate vacuum with hand vacuum pump until there is no more fuel from the return-flow pipe. Ensure that no fuel is drawn into the hand vacuum pump.
–  Connect return-flow hose -2- (marked in blue) to fuel filter.
  Note
Faults are stored as a result of separating the central plug connection for the unit injector. Therefore interrogate the fault memory and delete it if necessary → Vehicle diagnosis, testing and information system VAS 5051.
  S20-0283

Inspecting tandem pump (Superb II, Octavia II, Fabia II, Roomster) > < Removing and installing suction jet pump (Superb II, Octavia II)