The Delta's 42gal tank is in the rear. It will take somewhere around 6ft
of pipe to run the tube back there.  Would the tubing and amount of
return fuel be small enough that this would be an insignificant weight
for the complexity saved, or would I be better off with a sump in this case?
-------------------------


It looks to me like the return fuel line to the tank, will weigh much less
than any sump you could add.  Of course the sump would increase fuel
capacity some, but with 42 gallons already, you're not hurting for fuel.
Also, if you don't have a reliable gravity feed to the sump, you'd have to
add another fuel pump, which is even more weight.  

I have a 5 gallon tank that I had planned to install it in the nose of my
RV-3.  For a lot of reasons, I've decided not to do that for now. If the
weight, balance, and space will allow, I might eventually add it for the
extra capacity.  Pretty unlikely, unless I have to install it in the tail to
offset the weight of the turbo :-)

Cheers,
Rusty (still in radiator limbo)