Fuel system woes

Sean,

Of course a return line is always a good idea for all the reasons that you detailed, but it won’t solve this problem.  This is simply the fuel that is stored in the float bowls percolating up into the intake manifold when the engine is shut off.

Mark,

You did not mention an electric boost pump in your initial description so I assume there is not one.  So if you run the fuel out of your carbs during shut down that should solve the problem of heat soak flooding, but you still may have to crank the engine some for the mechanical pump to refill the bowls. I’m intrigued by the idea to opening the throttle after shut down. Not sure if it would help but the reasoning is sound…give it a try.  And as suggested by Michael, if you have an oil door opening that after shutdown may help.