If you want to get rid petrol tank for some reason or start the engine always on LPG without using a petrol Europegas Avance controllers have this option for you.
To set up Europegas Avance ECU to start only on LPG you need:
1. Go to: Options->Preferences and tick "Expert mode"
2. Go to Advanced tab on the panel below and in Emergency start section change Remember start on gas option to ON
3. IMPORTANT! Start the engine pressing LPG/Petrol switch button, release the button after engine has started. From now on engine will start on LPG every single time.