gasman, thanx for the pointer to the bulkhead tee w/ backflow check valves.

wouldn't these check valves prevent fuel from flowing back into the tanks from the supply lines when the vehicle is parked? wouldn't that then require some sort of relief vent in the lines, in case the trapped liquid heats up enuf to increase pressure beyond safe limits?

or is the solution to mount such a tee w/checkvalves as far away from the tanks as possible? ie, right by the main (VFF30) lockoff...

clear as mud. ok, at least i have enuf info to talk to my installer guy about it all. Thanx guys!