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This is reaching back a bit in the memory, but I believe you could be experiencing heat soak resulting in vapor lock. You need to use phenolic spacers to reduce heat transfer from the case into the induction system.
Also, Grady Clay advised me on this way back once when I was having fuel boil-over in one Weber. I believe he recommended making the fuel system a return loop rather than the dead-end type. This would allow recirculating cooling of the fuel.
I have also heard of guys using creative heat-reduction strategies such as wraps and shields to reduce radiant heat soak, but I believe the bulk of it comes through conduction from direct contact.
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