I want to install the throttle and mixture cables next, but I need the throttles out of the way to get the tank in and out. I'm 99% sure I'm done riveting things to the upper firewall, so I went ahead and put the tank back in so I could reinstall the throttles.
I'm glad I did end up having to pull the tank, because while carrying it around I noticed a bunch of debris rattling around inside. After some investigation, I discovered that the brass plug I had installed in the large fuel supply fitting (just to keep dust and stuff out) had corroded the aluminum fitting and created a bunch of flaky deposits. I removed the bulkhead fitting and ordered a new one to replace it, and then gave the tank a real good flush with the garden hose. Finally, before I re-installed the tank (hopefully for good), I put a few pieces of teflon anti-chafe tape along the upper front edge, where it's very close to the firewall. Then I put it back in the plane!
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