Volkswagen Touareg 2003 Workshop Repair Manual page 126

Touareg 2003 ➤
8-cylinder injection engine - Edition 11.2011
– Connect tester -V.A.G 1371- to breather line -arrow- as shown
in illustration.
– Connect valve adapter of tester -V.A.G 1371- to tyre valve.
– Regulate the pressure to 35 mbar with valve -A-. When the
pressure has stabilised, it must not drop below 30 mbar after
5 minutes.
If no pressure builds up or the pressure is not held for at least 5
minutes, localise leak as follows:
– Perform visual check on all components and hoses of the fuel
system.
Note
Also check fuel tank cap for leaks.
Only if still no fault has been detected:
– Check breather line and activated charcoal filter for leaks. To
do this, disconnect breather line -A- from activated charcoal
filter and seal connection with a plug -B-.
– Repeat pressure test.
If pressure still drops, the leakage can be found on the activated
charcoal filter or breather line:
– When valve is open -A-, check the following lines and compo‐
nents for leaks by hearing, touching, with commercially avail‐
able leak detector spray or using ultrasonic tester -V.A.G
1842- .
♦ Line from engine compartment to activated charcoal filter.
♦ Activated charcoal filter
If the pressure does not drop again, the leakage can be found on
fuel tank:
– To do this, reconnect breather line -A- to activated charcoal
filter.
120
Rep. gr.20 - Fuel supply system