void OnTriggerEnter(Collider other)
    {
        MSVehicleController controller = other.transform.GetComponentInParent <MSVehicleController> ();

        if (controller)
        {
            float max = controller._fuel.capacityInLiters;
            controller.currentFuelLiters += fuel;
            controller.currentFuelLiters  = Mathf.Clamp(controller.currentFuelLiters, 0, max);
        }
    }
 void Start()
 {
     _AILogicComponent = GetComponent <MSVehicleController> ();
 }