Prior to riveting the outboard upper trailing edge, I needed to install the fuel tanks so that I could reattach the aux fuel vent, which is in a location unaccessable after the pocket rivets in place. I then pressure tested the currently installed lines. I needed to use a very low pressure as the aux tank made ominous noises when pressurized. I adjusted the fuel tanks as much as possible to position the fuel fillers appropriately. Loctite was used on the fuel tank strap screws to prevent loosening.
