Volkswagen Golf 1999 Service Manual page 412

Secondary air system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=...
- Inspect complete EVAP system for escaping
smoke.
Note:
It may be necessary to move, twist, or wiggle
EVAP components around to reproduce leak.
If leak cannot be found using smoke:
- Locate leak with ultrasonic tester.
General search: tester only
Localized search: tester with extension
wand (left)
If leak cannot be located:
- Disconnect and plug or clamp shut EVAP lines
to isolate fuel tank using special tool 3094 or
equivalent before continuing.
CAUTION!
Clamp only soft rubber lines when isolating a
leak. To avoid risk of damage, never clamp hard
plastic lines!
If flow stops:
- Reconnect EVAP lines and search area that was
isolated.
When leak has been located:
- Repair leak and repeat EVAP system test.
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