16 00 510 Conducting leak test on fuel tank and tank ventilation system
WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The following procedure is only applicable to vehicles with the tank leak diagnosis module (DM-TL).
- Select "4 Expert mode" function on Diagnosis and Information System (DIS).
- From the menu "2 Activate components", select the function "127 Activation DMTL pump". Following appears in display: DMTL pump; pump is activated.
- Tank leak diagnosis pump pressurizes fuel tank and tank venting system.
For vehicles without tank leak diagnosis module: Pressurize through filler neck. Refer to 16 00 100 Checking fuel tank and tank ventilation system for leaks .
When leak-testing with a leak detector: follow manufacturer's operating instructions.
CAUTION:
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.
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:
- Tank cap leaking (check tank cap pressure relief valve), refer to 16 11 130 Checking filler cap pressure relief valve
- Tank venting lines leaking (fuel tank - carbon canister - tank venting valve).
- Tank venting valve leaking (engine compartment)
- Fuel level sensor flange on tank leaking