Filler Problens

[Huskie0]

Hi all,

I'm playing on Big Dig, and I have a filler that is automatically running. Simple enough, right? Well, apparently not. I have cobblestone being fed into the filler by cobblestone transport pipes, and whenever the filler gets to be empty, the cobblestone doesnt go into the filler, it instead gets ejected from the pipe when it reaches the filler. I tried putting insertion pipes in instead of the cobblestone pipes, but it still happened. It seems that the cobblestone can't be fed into the filler unless there is already cobblestone in it. Any ideas to what I'm doing wrong?