The other problem is that nitrogen, which is useless to your burner, is a major part of the producer gas. For storage purposes you'll be wasting a lot of volume.
Might calculate the volume the vacuum pump will pull and size your burn tube based on that. Also a vacuum pump will not stand up long unless you scrub your gas pretty well before it gets to the pump. Not sure of the pneumatic schematic for your system, but are you sure you want to draw a vacuum on the 275 gal tank?
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