Fuel System, Checking For Leaks
Special tools and workshop equipment required
- Evaporative Emissions Tester :KLI 9210
- Evaporative Emissions Tester - Adapter 55 :KLI 9210/55-1
- Hose Clamps - Up To 25 mm :3094
| Connector Coupling | Color Coding on Connector Coupling |
|---|---|
| Fuel supply | Black |
| Fuel Return Line | Blue |
| Bleeder | White or beige |
Evaporative Emissions Tester :KLI 9210 Preparation:
Depending on the version, the appearance of the :KLI 9210 may vary.
-- Check on :KLI 9210 whether there is enough fluid in the smoke generator.
-- Set the valve -D- to "Hold".
-- Open the nitrogen bottle -H-.
-- Connect the measuring hose -G- to the self-test connection -B-.
-- Set the valve -D- to "Test".
-- Using the pressure reducer -J- adjust the pressure to 25 mbar (10 in. H2 O).
-- Set the valve -D- to "Hold".
- The pressure must now be maintained for a minimum of two minutes.
If the pressure is not maintained, check the tester.
Fuel System, Checking for Leaks:
-- Connect the :KLI 9210/55-1 to the breather lines -A- "white markings" as illustrated.
-- Connect the measuring hose -G- on the :KLI 9210 to the :KLI9210/55-1 .
-- Connect the :KLI 9210 to the vehicle battery.
-- Remove right rear wheel housing liner.
-- Tightly close the hose to the air filter -arrow- using a hose clamp.
-- Set the valve -D- to "Test". The fuel system is now filled.
-- Watch the pressure gauge -C- and the flow meter -E-. The fuel system is filled if the flow rate decreases and the pressure increases to 10 in. H2O (25 mbar).
-- After the pressure has stabilized, set the valve -D- to "Hold".
- The pressure must not drop below 8 in. H2O (20 mbar) after five minutes.
If the Pressure Drops or if No Pressure Develops, Then Locate the Leak as Follows:
-- Set the valve -D- to "Test" and fill the system with smoke.
-- 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 the lines, hoses and the fuel filler cap for escaping smoke.
Illuminate components and hoses with a strong flood light, the smoke will be more visible.
An ultrasonic sensor tester or commercially available leak spray can also be used to locate leaks.
Depending on how long fault finding lasts, the smoke generator button may need to be pressed again. This ensures there is enough smoke present in the fuel system.
The installation opening inside the passenger compartment must be opened to check the flange on the fuel pump and fuel filter.
-- Replace any leaking hoses or components.