fuel.lua

function refuel()
fuelLevel = turtle.getFuelLevel()/turtle.getFuelLimit()
    while true do
        if fuelLevel < .50 then
            print("Refueling")
            turtle.select(16)
            turtle.suck(32)
            turtle.refuel(32)
        else
            print("Fuel level above threshold.")
            break
        end
    end
end

refuel()