Just pick up a used Carden with a DA 100. Was told that it had running issues. I think that I found the problem.

Yep think you found it Solder a tube in the hole,and run the line inside the fuselage

that sounds like a good plan. I’m going to put all new lines in too and maybe a fresh stopper. It has a Dubro tank but has aluminum cap instead of the black one.
Have any of you guys had gasoline rot the brass tubing like glow fuel does?
I’ve never had that happen myself. I could always put fresh brass in.

You posted this in the classifieds…..🤦‍♂️

oops.