I do NOT fly ARF's. But reading here as much as I do I see lots of complaints on ARF fuel tanks. It seems some develop cracks and tears while others have serious issues with stoppers. I feel the less than 10$ for a quality tank would be worth it. I would also look hard at the quality of the rest of the hardware. ARF manufactuers tend to use the least expensive hardware they can to maximize profits. I am not saying in any way the hardware is all inferior. Just look for defects and change any hardware that you are wary of. I am not knocking ARF's in any way! I am a good builder and love to make my own planes. I usually build from kits. But am now starting to do plans building. Anyway I digress, Just look closely at the tank and hardware. BTW I use Hays tanks whenever possible.

Mark Shuman