The one on my dad's duramax goes from the aux. tank to the filler hose and is only fed by a pump about the same size as the old 6.4l chev. lift pumps. I say you would end up fing something up or blowing the hose off of the vent.
The Hoffmans are actually nice people,discovery makes them out to be idiots for ratings. I met Todd,Jack and Jim after they finished filming season two,got to work on Todd's Ford.