We ran into this problem as well. Anything less than a topped off tank would lead to starvation. We haven't made the jump to R-comp's but i'm sure it would be a nightmare.
+1 on the weight saving nothing having to run a full tank.
Were in the process of putting together a swirl pot and small pump for our car.
Here's a simular set-up I had in my GTR, something like this (smaller scale) would be perfect.
