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– Set valve -D- to “Test”. Set the available pressure to 10 in. H2O
(25 mbar).
– Observe pressure gauge -C- and flow meter -E-. When the
throughput quantity decreases and the pressure increases to
10 in. H2O (25 mbar), the fuel system is filled.
Note
Depending on the filling level of the fuel tank, this process can
take up to 3 minutes.
– Once pressure has stabilised, set valve -D- to “Hold”.
• After 5 minutes the pressure must remain at or above 8 in.
H2O (20 mbar).
If the pressure is not held for at least 5 minutes, localise leak as
follows:
– First check activated charcoal filter solenoid valve 1 - N80- for
leaks. To do this, clamp off hose to activated charcoal filter
solenoid valve 1 - N80- using a hose clip -arrow-.
– 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 10 in.
H2O (25 mbar), 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 the pressure still drops, perform “leak detection in fuel system”
⇒ page 211 .
After completing work, perform guided function “Checking fuel
tank breather system for leaks” using ⇒ Vehicle diagnostic tester.
6.2.1 Leak detection in fuel system
Test specification:
• Procedure for “checking fuel system for leaks” has been com‐
pleted ⇒ page 208 .
• Fuel system tester - KLI 9210- is connected to vehicle via
adapter hose - KLI 9210/57- .
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
6. Activated charcoal filter system (vehicles for USA and Canada) 211
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