First, debongers are now made by Risse Racing in Oregon.  Same product, good service.  My 360 has a single two speed dukes pump under the copilot seat, with a filter and a Red Cube.  All this downstream from the selector, then 3/8 tube thru the firewall to the gascolater.  Chris Zavatson advised me to put the pump in the lowest possible place to keep the impeller wet.  I have run one tank dry and switched with just a 3-4 second power loss.