Let's look inside
The fuel selector switch is located inside the car. Mounted in the dashboard, it is the most visible component of the system. The LED indicators - that can be fully customized to the colors of your preference – represent how much LPG is in the tank. They show how far you can drive before you need to refuel.
You can use the fuel selector switch to go from driving on LPG to petrol and vice versa.
The main components
The fuel selector switch does not operate on its own. It corresponds to the LPG computer mounted under the hood of this car. This computer is considered as the "heart of the system." It ensures overall system control and is linked to the other system components. Under the hood we will find these main components: The LPG reducer (eVP-500), which converts the liquid gas into vapor, the filter unit ensures the quality of the fuel, and the Keihin injectors inject LPG into the engine.
Aside from these components under the hood, the LPG system also contains an LPG tank in the car's trunk. This tank can (nearly always be installed in the spare wheel compartment, without losing any of the trunk space. The LPG tank in this BMW M340i stores up to 55 liters of LPG, giving it a driving range of almost 500 kilometers.
The adapter that is positioned next to the petrol filling point, enables you to simply fill the LPG tank. Please be aware that there are different (4) LPG adapters being used worldwide. If you travel overseas, you might need to use a different adaptor. So it's best to store them all in your car. The adapter is very easy to use; simply twist it on, attach the LPG filling gun, and start refueling.