What part of a candle draws fuel to the flame?

The purpose of a wick is to deliver fuel (wax) to the flame. Acting like a fuel pump, the wick draws the liquefied wax up into the flame to burn. Different wick sizes allow for different amounts of fuel to be drawn into the flame. Too much fuel and the flame will flare and soot; too little fuel and the flame will sputter out. There are literally hundreds of different styles and sizes of wicks. The type of wax used in a candle, as well as the candle’s size, shape, color and fragrance materials all impact wick choice. Selecting the correct wick is critical to making a candle that burns cleanly and properly. Reputable candle manufacturers take great care in selecting a wick of the proper size, shape and material to meet the burn requirements of a particular candle.

Source: National Candle Association