No one else has addressed one thing you said so I guess I'll chime in on it. You mentioned the orientation of the fuel lines on the tank should be vertical and this is incorrect. They should be horizontal. Depending on the motor and its orientation, the exaust pressure line is usually on the right side of the plane and tank as the muffler is usually on this side also (left side if you are looking at it from the front of the plane). The fuel pick up line and clunk is usually on the left side as the needle valve and carb inlet are usually on this side of the plane. The exaust tubing inside the tank should bend upwards at about a 70 degree angle and be near but not touching the top of the tank. This enables the tank to be filled properly and also prevents the clunk from getting hung on it. The pick up line and clunk need to be free to move up and down so it can still pick up fuel when you fly inverted. The clunk should be near but not touching the back of the tank. If it touches anything during its travel up and down, it may not pick up fuel properly, thus the lines need to be side by side(horizontal) and not vertical. You should also take care when installing the silicon fuel lines not to push the metal lines too far into the tank or you could cause the clunk to hit the rear of the tank . Hope this helps.