audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Fuel cooler > < Testing tandem pump

A3 Mk1

Fuel supply system - Diesel engines
Servicing tandem pump
Removing and installing tandem pump

Special tools and workshop equipment required
 
W00-0464
  • ◆ V.A.G 1921

or

  • ◆ VAS 5024
 
W00-1187
  • ◆ VAS 5226

or

  • ◆ Hand-operated vacuum pump V.A.G 1390 with bleeder container V.A.G 1390/1.

Observe rules for cleanliness .

Removing
 
A10-0929
  • ‒ → Pull out oil dipstick -1- from guide tube.
  • ‒ Remove engine cover -arrows-.
  • ‒ Re-insert oil dipstick into guide tube.
  • ‒ Remove air intake hose between top air intake pipe and air cleaner housing.
Warning
  • ◆ The fuel system is under pressure. Place a cloth over the connection before opening the system. Then open the connection carefully to relieve pressure.

  • ◆ In extreme cases the fuel pipes/hoses or the fuel can reach a temperature of 100 C on vehicles with unit injector engine. Allow the fuel to cool down before disconnecting the pipes/hoses - acute danger of scalding.

  • ◆ Wear protective gloves.
  • ◆ Wear protective goggles.
 
A20-0891
  • ‒ → Disconnect fuel supply hose -2- from tandem pump.
  • ‒ Disconnect fuel return hose -1- (with blue marking) from fuel pipe.

  • ‒ Connect compressed air line to diesel fuel extractor unit VAS 5226.
 
A20-0899
  • ‒ → Connect diesel fuel extractor unit VAS 5226 to fuel return hose.

Notes:

  • ◆ You can also use hand vacuum pump V.A.G 1390 with bleeder container V.A.G 1390/1 instead of diesel fuel extractor unit VAS 5226.
  • ◆ It is important to empty the bleeder container in good time to prevent any fuel from entering the vacuum pump.
  • ‒ Operate diesel fuel extractor unit VAS 5226 until no more fuel comes out of return hose.
 
A20-0686
  • ‒ Disconnect fuel return hose -1- from tandem pump.
  • ‒ → Disconnect vacuum hose -2- from tandem pump.
  • ‒ Remove bolts -arrows-.
  • ‒ Remove tandem pump -3- from cylinder head.

Installing

Install in reverse sequence; note the following points:

Notes:
 
A20-0611
  • ◆ Always replace tandem pump seals.
  • ◆ Ensure proper seating of tandem pump coupling in camshaft.
  • ‒ → Install tandem pump and tighten upper securing bolts to 20 Nm.
  • ‒ Tighten lower securing bolts to 10 Nm.
  • ‒ Connect all hoses to tandem pump.

Fuel cooler > < Testing tandem pump