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– Close shut-off valve of pressure gauge. Lever stands perpen‐
dicular to direction of flow -arrow-.
– Hold switch of remote control until no more pressure increase
is observed on fuel pressure gauge.
• Specified value: approximately 6 bar positive pressure
If specification is not obtained:
– Check delivery quantity of Fuel Pump (FP) ⇒ Fuel Supply
System; Rep. Gr. 20 ; Diagnosis and Testing .
Checking Residual Pressure
– Check for leaks and for residual pressure by observing the
pressure loss on the pressure gauge.
• After 10 minutes there must be a residual pressure of at least
3.75 bar.
The holding pressure drops below 3.75 bar:
♦ Check connection between fuel pressure gauge and fuel line
for leaks.
♦ Check pressure gauge for leaks.
♦ Check fuel lines and their connections for leaks.
♦ Replace fuel filter with integrated fuel pressure regulator ⇒
Fuel Supply System; Rep. Gr. 20 ; Removal and Installation .
♦ Replace fuel pump ⇒ Fuel Supply System; Rep. Gr. 20 ; Re‐
moval and Installation .
Assembly is in reverse order of removal, note the following:
Note
Before disconnecting pressure gauge, release pressure by open‐
ing shut-off valve. Hold a container in front of connection for this.
Tightening Specifications
Component Nm
Fuel line to fuel rail 28
4.2 Wiring and Components, Checking with
Test Box VAG 1598/42
Special tools and workshop equipment required
♦ Adapter cable -V.A.G 1598/39-
Audi A6 2005 ➤
Fuel Injection and Ignition - Edition 03.2008
24 Rep. Gr.24 - Fuel injection system
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