A lot of cars built in the late 70's and early 80's started having a small return line taking excess fuel(and vaporized fuel) from next to the carburetor back to the fuel tank. I've installed something similar on a 1965 Mustang that had vapor locking problems, and it solved the problem.
My Amphicar isn't near the point of completion, or I'd experiment with a return line. It's plenty hot in Texas now to test one out. Maybe one of the experts could figure out a set-up.
Ted Matthews


        
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