One pipe and one transfer pump (low fuel level) to two supply tanks, is a risky game.
http://www.airbushelicopters.com/sit...uel_system.pdf
There are two pumps and two pipes in parallel circuit. I'd expect the pump capacities vs pipe bores and fuel demand to have been considered for all the possible failure conditions...that's first year mech eng stuff. Looks like a perfectly sound system to me, assuming that there is a strainer/filter before the tanks, which there is bound to be.