Audi Workshop Service and Repair Manuals

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ → V.A.G 1368 Vacuum tester

• ◆ → V.A.G 1390 Hand vacuum pump

Test conditions

• ● Solenoid valve tested and test OK

Note:

This test covers the pipes from the intake manifold to the vent opening on the lower side of the activated charcoal filter.

Test sequence

• ‒ → Pull connecting hose -arrow- to activated charcoal filter off tank breather pipe (white).

Note:

Press buttons on hose couplings to do this.

• ‒ Remove fuel filler cap.

• ‒ → Connect hand vacuum pump V.A.G 1390 to vacuum tester V.A.G 1368 -connection B- and breather pipe.
• ‒ Set vacuum tester to -A/B- position.
• ‒ Operate V.A.G 1390 several times. Vacuum must
      not build-up.

If vacuum builds-up:

• ‒ Check gravity valve , Item 2
• ‒ Check pipe -1- (white) for bends or plugging.

If vacuum does not build up:

• ‒ Refit fuel filler cap.
• ‒ Operate hand vacuum pump V.A.G 1390 several times.
      Vacuum must not
  build up.

Note:

If the fuel level in the tank is low the hand vacuum must be operated at least 20...30 times.

If vacuum builds up:

• ‒ Replace fuel tank cap.