Dont want to muscle in on your design BUUUUUUUUUUUUt how about knocking up the mock as two tanks with a link pipe. That way it would still only need one filler/vent, may also help with the fuel sloshing about.That would be a minimum amount to loose capacity wise but might just be able to wiggle out for access. Whatever its the way to go and will keep my beady eyes on this development.
Bob
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