That might do it. I'm not saying, of course, that 110LL and PVC don't mix at
all, or that you would necessarily have problems with a PVC pipe imersed in
110LL. However, I don't recall ever seeing that particular combination
recommended anywhere in any of my compatibility charts.

Just for gets -n- shiggles, here's what I'd do. Find a local industrial
supplier in your area that sells either Ingersoll-Rand, Lincoln, or Graco
diaphragm pumps. (They'll probably be either hydraulic or pneumatic equipment
suppliers.) Tell them you are thinking about setting up a fuel transfer
system, and ask for a recomendation on the type of pipe material and pump you
should use. Make sure you tell them that you're gonna pump 110LL, that you
need a very lightweight system, BS, etc. They may have a few ideas.

BTW, was there any reason that an aluminum tube could not have been used?

Harry