pos = { x = 0, y = 0 }

function checkFuel()
    if(turtle.getFuelLevel() < 2) then
        if(not(turtle.refuel(1))) then
            print("Out of fuel!")
        end
    end
end

function forward()
    checkFuel()
    if(turtle.forward()) then
        pos.x = pos.x + 1
    end
end

function back()
    checkFuel()
    if(turtle.back()) then
        pos.x = pos.x - 1
    end
end

while true do
    print("eat dick")
    forward()
    os.sleep( 1 )
    back()
    os.sleep( 1 )
end