" Ok..
So, the tanks ar
" Ok..
So, the tanks are different; the lines and bulb are new and you are sure the vents on the tanks are open when you are running it. I can't see what's going on, and I don't doubt you competence, but be sure that you have opened the vents on the tanks. You probably know what I am talking about, but the vents can be screwed in or out, and if these are jerry jug type portable tanks, the vent is probably on the cap. Just for kicks, you could try it with the cap off.
Ok, the next two things I would suspect are going to be:
1. Assuming all lines are new, the fitting on the line, before the primer bulb that connects to the tanks (this can definitly get screwed up and clog).
2. The primer bulb is either installed backwards (this would definitly cause the same problem) or the primer bulb is defective (which definitly happens).
Jon "