16 00 510 Conducting Leak Test on Fuel Tank and Tank Venting System

16 00 510 - Leak test on fuel tank and tank ventilation system (DMTL)





Important!
On vehicles with tank leak diagnosis modules (DMTL), do not work with external pressurization as the tank ventilation system will leak under this condition.
On account of the escaping fuel vapors, these tasks should only be carried out in well ventilated rooms or with a suitable extractor facility provided.
Observe country-specific accident prevention and occupational safety regulations.

In the Diagnosis and Information System (DIS), go to the "Function and component selection" page.
By selecting:
- Service functions
- Drive
- Digital Motor Electronics
- Activation DMTL pump
Adopt test module in test schedule.
Switch to the test schedule and implement the "Activation DMTL pump" test module.
Leak diagnosis pump pressurizes fuel tank and tank ventilation system.
Carry out leak test.
Terminate test module after completing leak test.





Note:
Leak diagnosis pump is automatically shut down after approx. 15 minutes due to risk of overheating. Allow pump to cool down for at least 15 minutes. Then continue procedure.





The leak test can be carried out with a leak detector. Follow manufacturer's operating instructions in doing so.
Possible causes of leaks are:
- Fuel filler cap leaking Testing and Inspection
- Tank vent line leaking (fuel tank - carbon canister).
- Tank vent line leaking (engine compartment).
- Locking ring on fuel filter leaking