Method 2: Locate Leak With Ultrasonic Tester

General search: tester only

Localized search: tester with extension -left in illustration-

Fig 1: Identifying Ultrasonic Tester

Courtesy of AUDI OF AMERICA, LLC

If leak cannot be located:

-- Disconnect and plug or clamp shut EVAP lines to isolate fuel tank, using Hose Clamps Up to 25 mm Dia. :VAS3094 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 to search area that was isolated.

If leak or source of fuel odor cannot be found:

-- Contact Audi Dealer Technician Helpline.

CAUTION:

Under no circumstances should the vehicle be returned to the customer without proper diagnosis and repair.

When leak has been located:

-- Repair leak and repeat EVAP system test.

-- Perform quality check and return vehicle to customer.

NOTE:

Because leak may be at top of fuel tank, it may not be possible to locate through fuel pump/sending unit access plate.

Fuel tank may need to be lowered to locate the leak.