Volkswagen Touareg 2003 Workshop Repair Manual page 133

– Repeat pressure test by setting valve -D- again to „Test".
– Observe pressure gauge and flow meter. When the through‐
put quantity decreases and the pressure increases to 25 mbar
(10 in. H2O), the fuel system is filled.
– Once pressure has stabilised, set valve -D- to „Hold".
– If the pressure does not drop again, renew activated charcoal
filter solenoid valve 1 -N80- .
If pressure still drops:
– Set valve -D- again to „Test".
– While fuel system is being filled, press button -I- for smoke
generator for approx. one minute.
The fuel system is now pressurised and filled with smoke.
– Check whether smoke escapes from any visible fuel system
line or hose. Also check fuel tank cap.
Note
Light up the components and hoses with a strong floodlight. In
♦
the floodlight, smoke is more visible.
For leak detection in accessible areas, also use ultrasonic de‐
♦
tector or commercially available leak detecting spray.
Depending on how long the fault finding takes, it may be nec‐
♦
essary to press the smoke generator button from time to time.
This ensures that sufficient smoke is present in the fuel sys‐
tem.
If no fault is found:
– Remove rear right wheel housing liner.
If smoke escapes from air filter
– Clamp off hose between activated charcoal filter solenoid
valve 2 -N115- and air filter -arrow-. Also refer to
⇒ Item B (page 128)
– Observe air filter. If smoke no longer escapes, activated char‐
coal filter solenoid valve 2 -N115- is leaking. Renew activated
charcoal filter system solenoid valve 2 -N115- .
⇒ Item 7 (page 128)
.
8-cylinder injection engine - Edition 11.2011
:
4. Activated charcoal filter system (vehicles for USA and Canada)
Touareg 2003 ➤
127