Large Leak In Fuel System Test

WARNING: This page is about a different variant/trim than selected.

Test Conditions:

The evaporative emissions tester KLI 9210 and the adapter hose KLI 9210/55-1 are connected to the vehicle. Refer to EVAP/FUEL SYSTEM, CHECKING FOR LEAKS .

Fig 1: Connecting Measuring Hose From Evaporative Emissions Tester KLI 9210 To Adapter For Evaporative Emission Tester KLI 9210/55-1
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the evaporative emissions tester KLI 9210 to the vehicles battery.

-- Remove the rear right wheel housing liner.

-- Clamp off the hose between the leak detection pump -V144- and the air filter housing using a hose clamp up to 25 mm dia.3094 -arrow-.

Fig 2: Clamping Off Hose Between Leak Detection Pump (LDP) V144 And Air Filter

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Set the valve -D- to "Test".

Fig 3: Identifying Evaporative Emission (EVAP) Canister Purge Regulator Components

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- While the fuel system is being filled, press the smoke generator button -I- for approximately one minute.

The fuel system is now under pressure and filled with smoke.

-- Check all fuel system lines and hoses for escaping smoke. Also check fuel fill tube cap.

NOTE:

Illuminate components and hoses with a strong flood light, the smoke will be more visible.

To check for leaks at accessible locations, also use a ultrasonic measuring device or commercially available leak detection spray.

Depending on how long the fault finding lasts, the smoke generator button may have to be pressed again. This ensures there is enough smoke present in the fuel system.

To check the fuel pump and fuel filter flange, the assembly openings in the vehicle interior must be opened.

-- Replace leaking hoses or components.

After completing the work, perform the "Check tank ventilation system for leaks" guided function using the vehicle diagnosis, testing and information system VAS 5051.