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Is your fuel pump camshaft driven or belt driven? If it is belt driven it could be run at a lower ratio (less than 1/2 speed), so as to reduce the overall flow rates.
The comments about vertical orientation of the return lines do tend to emphasize the desirability of a return scavenge pump. Would class rules permit that?
Could the combined return connections in the Willy's plumbing be separated into two returns, one for the overflow, and a separate one for the supply side to dump the pump output when the barrel valve is closed at high RPM?
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