Tandem Pump

Tandem Pump

Special tools, testers and auxiliary items required

• Torque wrench (V.A.G 1331)

• Hand vacuum pump (V.A.G 1390)

• Hand vacuum pump reservoir (V.A.G 1390/1 )

• Hose clamp pliers (V.A.G 1921) or Pliers for spring clamps (VAS 5024A)

Removing

Observe safety precautions => [ Safety Precautions ] Fuel Supply.

Observe rules for cleanliness => [ Clean Working Conditions ] Fuel Supply.

CAUTION!
• The fuel or fuel lines in fuel system can become very hot (danger of scalding)!

• In addition, the fuel system is under pressure! Before opening the system, place cloths around the connection area and release pressure by carefully loosening the connection!

• Wear protective goggles and protective gloves when working on the fuel system!

- Pull off the supply hose - 1 - (white marking) and the return hose - 2 - (blue marking) from the fuel lines on the cylinder head.





- Connect the hand vacuum pump (V.A.G 1390 ) with the breather reservoir (V.A.G 1390/1) to the return line - 3 -.

- Operate the hand vacuum pump, until no more fuel runs from the return hose. Make sure that no fuel is sucked into the hand vacuum pump.

- Disconnect vacuum line - 1 - from brake booster of tandem pump - 4 -.





- Pull off the supply hose - 2 - (white marking) from the tandem pump - 4 -.

- Remove mounting bolts - arrows -.

- Remove tandem pump - 4 - from cylinder head.

- Pull the tandem pump - 4 - slightly upward, pull off the return hose - 3 - (blue marking) and remove the tandem pump - 4 -.

Installing

Installation is performed in the reverse order of removal, noting the following:

• Make sure that tandem pump coupling has proper seating in camshaft.

• Tandem pump seals must always be replaced.

- Connect the return hose - 3 - (blue marking) to the return connection on the tandem pump.





- Install the tandem pump and tighten the upper bolts to 20 Nm.

- Tighten lower bolts to 10 Nm.

- Connect the supply hose - 2 - (white marking) to supply connection and the vacuum line - 1 - from the brake booster to the tandem pump - 4 -.

- Connect the supply hose - 1 - (white marking) to the fuel line on the cylinder head.





- Connect the hand vacuum pump (V.A.G 1390 ) with the breather reservoir (V.A.G 1390/1) to the return line - 3 -.

- Operate the hand vacuum pump until fuel starts to escape from the return line - 3 -. Make sure that no fuel is sucked into the hand vacuum pump.

- Connect the return hose - 2 - (blue marking) to the return line - 3 -.