turtleLib/fuel

hasRefuelled = false
tank = turtle.getFuelLevel()

function refuel(x)
  if tonumber(x) == 1 then
    display = true

  else
    display = false
  end


  if tank < 200 then

    for slot = 16,1,-1 do
      turtle.select(slot)
      hasRefuelled = turtle.refuel(slot)

      if hasRefuelled == true then
        if display == true then
          print("Refuelled.")
        end
        return true
      end

      if slot == 1 then
        if display == true then
          print("Out of fuel!")
        end
        return false
      end
    end

    else
      if displau == true then
        print("No fuel needed.")
      end
      return false

  end
end