I used a Dremel tool to shave the heads off the three studs. It falls right apart after that.
Make note of the order the pieces come off, as well as the orientation of the vent holes that go through a few of the pieces.
If the tank can't breathe through the vent hole the engine will starve.
Rivets worked to reassemble after cleaning, lubing, and installing a new seal.
Use the shortest rivets that'll work. Mine seems to catch slightly sometimes when closing the cap.
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