LloydC130,

You have to properly manage the fuel with the pumps and bypass valves for the fuel to be taken from the tanks. If you leave all the bypass valves open and all the pumps on, it will take from the main tanks first. then start pulling from other available tanks. If the pumps for the aux and ext tanks are not on, it will never take from them even if they are full. Play with the bypass valves and pump switches to get a feel for what positions they need to be in for the fuel to be drawn from a specific tank. I regularly pull fuel from belly tanks for both engines to balance the main tanks with the wing tanks. About the only thing I have never figured out is how to transfer fuel from one tank to another. I do not think that is possible, but not a problem since you can use any tank to supply fuel to any engine.

Dave