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Hi Steve, my name is Jason.
I don't thinking you have the correct idea of what vapor lock is. A running engine can not vapor lock. What exactly is the engine doing, is stalling when you idle it for a long time?
These engines do not like to idle for long periods of time, they can flood out. How long are you idling the engine for exactly?
No. The blower won't have anything to do with this. What's happening is the engine is flooding out. These engines are not designed for excessive idling. All marine engines run rich by design, and excessive idling can cause them to flood out. Why are you idling the engine for so long, are you trolling with it?
Is your engine under warranty? If yes, have you spoken with the dealer yet?
You are very welcome. Specifically what you want to have them check is fuel pressure, and then check and see if any of the fuel injectors are leaking down. If the engine is running any richer than it should that will cause the stalling. In the mean time, see if you can get your rpms up a little bit, that will help keep it from stalling as well. In a nutshell what is happening is the engine is loading up with fuel and flooding out, that is what is causing the stalling.