DME 7.8 DME 7.8 0 · ♦Do not produce a vacuum of more than 100 mbar, as o

DME 7.8 DME 7.8 0 Figure: Note! ♦Do not produce a vacuum of more than 100 mbar, as otherwise the vacuum will cause the shutoff valve to open. ♦If no vacuum can be built up, replace the shutoff valve. ♦Coat the sealing ring of the new shutoff valve with tyre fitting lubricant prior to installation. ♦The shutoff valve can only be installed in one position: with the electrical connection facing upwards. Work instruction Display OK If not OK 2 Check tank system for ♦Check the tank system for leaks leaks using an HC tester. To do so, hold the connecting hose of the HC tester in the spot to be tested. In the case of a leak, the display of the HC tester increases to above 1000 ppm. Values below 50 ppm indicate no leaks. ♦To test the ventilation lines, guide the connecting hose slowly along them. ♦Check the following locations 1. Tank cap 2. Line connections to EVAP can- ister 3. EVAP canister 4. Line connections to fuel tank sender unit 5. Pressure sensor 6. Opening of fuel filler neck into tank 7. Line connection of EVAP canis- ter purge valve 8. Ventilation lines 2023 P0442 0-66 page 3 Printed in Germany – 1, 2000 p0442