I think I know the answer to my question but I want to make sure. The scenerio is this. I flew this jet with just two large 50oz Dubro tank and uat running amt280.
Then added two more 24oz saddle tank to add more flight time and they are in series configurations. Today I replaced the amt280 with 450 ran it did not noticed this problem until and shut down the engine and look what happened. Most of you guys probably know exactly what's wrong here. So what's wrong with this setup !!!.

Note: picture #4 electric starter mod... no more freaking scuba tank to log around