/// <summary>
/// sets a Zapfhahn as the currently selected one
/// </summary>
/// <param name="requestedZapfhahn">the Zapfhhan to set as selected</param>
public void Selectzapfhahn(Zapfhahn requestedZapfhahn)
{
this.selectedZapfhahn = requestedZapfhahn;
}
/// <summary>
/// gets the corresponding FuelTank with the Fueltype provided
/// </summary>
/// <param name="fueltype">the fueltype which is requested</param>
public void GetFuelOfType(FuelType fueltype)
{
Zapfhahn zapfhahn = zapfhaehne.Find(x => fueltype == x.GetFuelType());
}