I really get persnickity with tank installs just because its a rather common source of aggrivation. I have watched people spend hours fartin' around with a pour running engine that had bad fuel flow or an air leak. I retube the tank almost any time I have one out. Smooth off the tubing ends as they can cut lines. Make sure your not getting foaming from vibration as well. Bad tank installation cause lean runs . Lean runs kill RC engines.

Here is a little engine document that is PRICELESS. I have new guys copy print it out and keep it in there field box. Save the web site and share with others.

http://www.smrcc.net/Tips/Engine/2-stroke_engine.html