FillHole

selectedSlot = 2

function tanken()
    while turtle.getFuelLevel() <= 240 do
        turtle.select(1)
        turtle.refuel(1)
        turtle.select(selectedSlot)
    end
end

function items()
    if turtle.getItemCount(selectedSlot) <= 1 then
        selectedSlot = selectedSlot + 1
        if selectedSlot == 17 then
          selectedSlot = 2
        end
        turtle.select(selectedSlot)
    end
end

function checkup()
    turtle.turnRight()
    if turtle.detect() then
        turtle.up()
        turtle.placeDown()
        while turtle.back() do
            tanken()
        end
        turtle.turnRight()
        while turtle.back() do
            tanken()
        end
        turtle.turnRight()
        turtle.turnRight()
    else
        turtle.turnRight()
        turtle.turnRight()
    end
end

while true do
    turtle.select(selectedSlot)
    while turtle.back() do
        tanken()
        items()
        turtle.place()
    end
    checkup()
end