Now we address the fuel tank & plumbing the duel level overflow lines.
I uses 3 tank lines. The 2 on the top are the standard clunk & vent lines but the one in the center bottom is an overflow line that barely goes into the tank just beyond the stopper. Its purpose is to allow 1/2 of the 32oz tank to be filled to a consistent 16oz.




The vent line is "T"ed & the 2 lines exit the hatch under the chin.




The rear line overflows at just a smidge over 16oz, the front line is the full 32oz overflow through the vent.




I started making provision to secure the tank over the CG by using a Dremel tool to make oblong holes in the deck to allow a Velcro strap to be fished through for securing the tank. I also glued a 5/16" square block that will serve as the front limit to keep the fuel tank from shifting forward.




I made tray from 1/32" birch ply with more 5/16" block to cradle the rear & sides of the tank.




A basswood "key" block was fashioned to fit loosely into an existing cutout in the deck.




Sticky back Velcro is used to help secure the tank from excess shifting.

Another Velcro strap is used to secure the back of the tray to the tank. the back of the tray floats off the end of the deck.




Then, the Velcro strap previously fished under the deck to tie the whole thing down. Note that the vent line is looped behind the tank to prevent fuel siphoning when the plane is in a nose down attitude.




I fashioned a top plate from 1/8" lite ply to hold the whole thing down. Note the cut out for the vent blister.




Finally, the plate is secured W/#4 button head screws into the basswood rails. The deck is too long to be fished in & out of the cabin, so a short section of deck was fashioned & screw applied at the rear.