Fuel System Leak Test

Fuel System Leak Test

Test Conditions
- Procedure for "Checking fuel system for leaks" performed.







- evaporative emissions tester KLI 9210 with adapter hose KLI 9210/55-1 connected to vehicle

- Connect evaporative emissions tester KLI 9210 to vehicle battery.
- Remove rear right wheel housing liner.







- Clamp off hose between Leak Detection Pump (LDP) V144 and air filter - arrow -.







- Set valve - D - to "Test".
- Observe the pressure gauge - C - and flow meter - E -. The fuel system is filled if the flow quantity decreases and the pressure increases to 10 in. H2O (25 mbar).
- After the pressure has stabilized, set valve - D - to "Hold".
- After 5 minutes the pressure must not drop below H2O (20 mbar) drop.
- If the pressure no longer decreases, replace Leak Detection Pump (LDP) V144.

If the pressure is not maintained for a minimum of 5 minutes or if no pressure is built up, localize the leak as follows
- Fill fuel system with smoke by setting valve - D - to "Test".
- While fuel system is being filled, press 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 tank sealing 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 ultrasonic measuring device or commercially available leak detection spray.
- Depending on how long fault finding lasts, smoke generator button may have to be pressed again. This ensures there is enough smoke present in the fuel system.
- To check 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 "Check tank ventilation system for leaks" guided function using.