/thread.asp?trid=6450 [Thanks to Joseph H for going beyond what could reasonably be asked of him, and getting us this information] has some added information, and it seem as if this is a NFPA (National Fire Prevention Assoc.) standard, and is reflected in that OSHA sites the NFPA standard, and it has recently been updated to reflect an opinion that filling a tank on the machine, that can easily be removed from the machine to fill, is NOT the proper safe method. "
however I have not seen that the tank MUST be vertical (as much as this makes sense) while filling.
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