Yah, spelling is a bit offf, but jest of solving problem was informative if I understand it correctly. You put a known good engine with a known good tank in a new plane.
The external uniflow tube that should be in a good position to get the proper anount of air intake was not in the proper position because it was too short. You then added lenght to the tube to get it in the right place to pick up proper air intake and the engine ran as good as before, in the original plane, engine, tank combination.
Sounds like you fixed your problem just ducky, congatulations.
Be happy, fly well, have fun, enjoy. Thanks for sharing the problem solution.
Will file this my in troubleshooting memory bank, get er in the right place.
Tell me what I say.
Jerry