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Audi Workshop Service and Repair Manuals

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Removing and installing tandem pump - vehicles with 2.0 ltr. 4V engine > < Removing and installing tandem pump - vehicles with 1.9 ltr. and 2.0 ltr. 2V engine

A4 Mk2

Checking tandem pump - vehicles with 2.0 ltr. 4V engine
   
Checking tandem pump - vehicles with 2.0 ltr. 4V engine
Special tools and workshop equipment required
t  Tandem pump tester -VAS 5187-
  W00-0997
Procedure
Observe test conditions → Chapter.
Observe rules for cleanliness → Chapter.
–  Pull off engine cover panel -arrows-.
  WARNING
t  The fuel system is pressurised. Before opening the system place a clean cloth around the connection. Then release pressure by carefully loosening the connection.
t  In extreme cases the fuel lines and the fuel can reach a temperature of 100 °C on vehicles with unit injector engine. Allow the fuel to cool down before disconnecting the lines - danger of scalding.
t  Wear protective gloves.
t  Wear safety goggles.
  A10-10294
–  Remove screw plug -arrow-.
  Note
Tandem pump is shown with engine removed for illustration purposes.
  A20-1117
–  Connect tandem pump tester -VAS 5187- as shown in the illustration.
–  Start engine.
–  Increase engine speed to 4000 rpm.
–  Read the pressure on the gauge:
l  Specification: at least 10.5 bar
If specification is not obtained:
–  Clamp off return hose between fuel filter and tandem pump using hose clamp.
–  Increase engine speed to 4000 rpm.
–  Read the pressure on the gauge:
l  Specification: at least 10.5 bar
If specification is now obtained: pressure is being lost at unit injectors.
–  Renew O-rings at unit injectors.
If specification is not obtained:
–  Renew tandem pump → Chapter.
  Note
After removing pressure tester, tighten screw plug to 25 Nm. Renew the seal.
  A20-10005

Removing and installing tandem pump - vehicles with 2.0 ltr. 4V engine > < Removing and installing tandem pump - vehicles with 1.9 ltr. and 2.0 ltr. 2V engine