The instructions for the Facet are to install it at the lowest point in the system with the line from input to output going up at a 45 degree angle. I would suggest that they be installed according to instructions. They also call for a filter as do most carburetors.
There is a time for building and a time for FLYING and the time for building has expired. See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering