Conducting Leak Test on Fuel Tank and Tank Venting System

16 00 510 - Conducting leak test on fuel tank and tank ventilation system





Note:
The following procedure is only applicable to vehicles with the tank leak diagnosis module (DM-TL).
Select "Tank leak diagnosis module (DM-TL)" on Diagnosis and Information System (DIS).
- The leak diagnosis pump pressurizes the fuel tank and tank venting system for 30 secs.
- If pressure is required for more than 30 secs., reactivate the "Activate" button after 30 secs. in each case.
For vehicles without tank leak diagnosis module:
Pressurize fuel tank and tank venting system Checking Fuel Tank and Tank Ventilation System for Leaks.
When leak-testing with a leak detector: follow manufacturer's operating instructions.





Important!
On vehicles with tank leak diagnosis modules (DM-TL), do not work with external pressurization as the tank venting system will leak under this condition.
On account of emerging fuel vapors, carry out all operations in well ventilated rooms.Or use a suitable extractor system.
Observe country-specific accident prevention and occupational safety regulations.





The leak test can be carried out with a leak detector.
Possible causes may be:
- Fuel tank cap leaking (check fuel cap pressure relief valve) Testing and Inspection
- Tank venting lines leaking (fuel tank carbon canister - tank venting valve)
- Tank venting valve leaking (engine compartment)
- Fuel level sensor flange on tank leaking