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If you are experiencing vapor lock, anything you can do to get teh fuel line away from a hot engine component will help. using some heat resistant foil insulation around teh fuel line may help also.
An old trick from years ago, although it looks stupid (and i'm not exactly sure why it works) is to clip a half dozen wooden spring type clothespins to the metal fuel line. I was really skeptical too, untill I saw it work a few times.
ALso, make sure your carburetor bowl vent is functioning (solenoid opening when it is warm) and that the canister purge is not stuck on, causing a rich condition.
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