clarification "Exhaust port"I mearly ment the barb on the muffler, sorry about that. Also with the supplied fuel line and clunk it has little to no movement in the tank due to being so stiff. So I replaced it with fuel line for gas engines from my local hobby shop I will have to verify if it's tygon or silicon (Currently at work). However with the new line and heavier clunk I now have movement. I will do another pressure test on the tank just to verify a good seal. I will also try a longer fuel line to see if that helps the issue. It is rather odd on the bench she runs pretty good than when i get to the field it's a dog, and it causes me to not want to fly due to fear of crashing.