chuckLoader.lua

function checkFuel()
    if turtle.getFuelLevel() < 300 then
        for slot = 1, 16, 1 do
            turtle.select(slot)
            turtle.refuel()
        end
    end
end

while(true) do
    checkFuel()
    if(redstone.getInput("front")) then
        os.sleep(10)
    end
    turtle.forward()
    os.sleep(3)
end