If the third line goes straight through, you will have a tough time getting the fuel out. You may have to flip the plane on its nose. I normally just bend the brass filler tube down, and add a bit of fuel tube so it touches the bottom of the fuel tank with the stopper all the way on. This makes it so you can de-fuel with it sitting right side up. Some even put a clunk on this line (so they would have two clunks, one for the filler line and one for the pickup line), but I have never done it like this. Dont give up yet. You are almost there. It sounds like everything else is correct.