I've been seeing folks use electric fuel pumps for model airplane fuel transfer- small, less amp-hungry, and still can throw a nice stream.
http://www2.towerhobbies.com/cgi-bin...?&I=LXVZ40&P=7
http://www2.towerhobbies.com/cgi-bin...?&I=LXDJR7&P=7
First one says ok for 6 or 12v.
Pat M