After the 15 gallon RCI fuel cell cracked (the welds along a whole side cracked) at Rausch Creek, I chose to replace it with a 20 gallon cell that had a plastic inner cell. This meant also relocating the transmission fan.
Fabbed a new 85 degree fuel filler neck and fuel cell mount:
Thanks. I'll never run an aluminum cell like that again... at least not without careful thought and justification. When they split, they really split. It certainly isn't a slow leak.