Before you start tearing into the fuel or electrical system, apply a wet rag to any section of metallic fuel line that is near the carb. The "heat soak" issue has caused a number of vehicles to exhibit the same symptoms. The E10 fuel which we all now are forced to use, has a very low "phase separation" temperature (128 degrees F). When under-hood temps rise, the incidence of this phenomena increases. Once you cool the line the vapor lock will dissipate and fuel pressure/flow will return.
This issue has surfaced in both engines that are operating and those that have been shut down for 15-20 minutes. The key is to keep engine bay temperatures under control and shield lines that come in close contact with the exhaust system as well as the cooling system. Adding an electric pump on a momentary switch, in addition to the mechanical pump and adding a pusher fan with a timer that runs 10 minutes after shutting down the engine, has eliminated the problem.
Can't say that slapping a wet rag on the line will solve your issues.....but it's easy, quick, cheap and might identify your problem without having to drag out the toolbox.
Dave
