audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Servicing accelerator mechanism > < Checking fuel system for leaks - vehicles with 2.5 ltr. 6-cylinder engine

A4 Mk2

Checking fuel system for leaks - vehicles with 2.7 ltr. and 3.0 ltr. 6-cylinder engine
Checking fuel system for leaks - vehicles with 2.7 ltr. and 3.0 ltr. 6-cylinder engine
Special tools and workshop equipment required
   
t  Hose clamps for hoses up to 25 mm Ø -3094-
  W00-0079
t  Cooling system tester -V.A.G 1274- with adapter -V.A.G 1274/1A- and adapter for testing diesel fuel -V.A.G 1274/2-
A leaking fuel system can cause:
t  Foam build-up or air bubbles in the supply pipe
t  Lack of power, misfiring
t  Starting problems
  W00-0528
Procedure
–  Carefully pull engine cover panel off four retaining pins one after the other -arrows-.
  A10-10171
–  Secure adapter for testing diesel fuel -V.A.G 1274/2- with adapter -V.A.G 1274/1A- to cooling system tester -V.A.G 1274-.
  WARNING
The fuel system is pressurised. Before opening the system place a clean cloth around the connection. Then release pressure by carefully loosening the connection.
–  Unscrew fuel supply pipe at high-pressure pump and connect up hose of adapter for testing diesel fuel -V.A.G 1274/2- in its place.
  A23-10015
–  Fit hose clamps -3094- in engine compartment (rear right) at the following points:
l  Supply hose to fuel filter.
l  Return hose to fuel tank.
  Note
By moving the hose clamps -3094- from the filter to the fuel tank connections it is also possible to check the fuel pipes and the fuel cooler at the same time.
  A20-10068
–  Use cooling system tester -V.A.G 1274- to create a pressure of between 1.0 ... 1.5 bar.
–  If pressure drops constantly, locate leak and eliminate fault.
  A23-10015

Servicing accelerator mechanism > < Checking fuel system for leaks - vehicles with 2.5 ltr. 6-cylinder engine