This post is late but maybe this will help.
these motors have a tendency to burn fuel faster than the stock supply line can deliver at WOT. Especially when running WOT for any extended Length of time over a few minutes.
Do away with any sort of vacuum operated flow valve at the tank. These valves are restrictive and problematic. Use fuel line 5/16 min. dia. straight from the tank and a large capacity inline fuel filter.
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