I've been pondering. Before getting into the "pressurized mess' I've always used the quick fuelers. Now, with regulator and check valve, fuel never goes forward when filling. The third hole, with a tee and dot would clearly be the next option, but if fuel were to go forward it would go through the clunk to the carb before it would go to the muff. Last, if there were an access area to the feed side, split the line there and fuel as normal, but that would put you back to the beginning, quick fueler. Joe