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Older fuel pumps suck the fuel from the tank to the engine, and push it from the pump to the carb,and are susceptible to vapor lock because of this ( suction).

You can reroute and insulate the fuel lines so they stay cool, but the best most permanent way is to install an electric fuel pump as close to the fuel tank as possible, that way it is a pressure system and not prone to vapor lock.

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Q: Why do you always get a vapor lock on your 1977 2.0 when temps over 85?
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