Now that I've looked at your diagram, I see a good representation for others to follow. What you're missing is that the fluid passing through the venturi in the injector has it's velocity substantially increased. It is the increase of that velocity that provides the increase in flow. It might seem like some sort of Voodoo. But it really works. If you want, you can always use a separate line from the reservoir. Or you can use two reservoirs. In either case, you need larger lines to accommodate the flow. That just makes sense. If the flow is restricted, REMOVE THE RESTRICTION.

Shingoshi

Ok! I got smiley happy!