Fuel line run question

flyfish said

Also to note: Gasoline is more volatile than ethanol (i.e. has a lower heat of vaporization value compared to ethanol), so running gas with less ethanol really doesn't sound like the move here. I have heard this for many years, but looking at the delta H values, it just doesn't make sense to me (maybe I'm missing something). Finding a better route for the fuel lines, or better protection from heat soak and radiant heat is what you need.

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All I can tell you is with typical 89 octain pump gas with ethanol my stock 273 dart would almost die after 50 yards of normal acceleration when the engine was hot on a hot day and you could watch the clear fuel filter fill with vapor ( kept pressure)

Then I switched to 89 octane alcohol free and have not had the problem happen again. And I have tried to make it happen. 98 degree day sitting in a fast food line in gear for 5 to 10 minutes is all it would take in the past. Now ideling in gear for 15 minutes 98 deg day. Then start driving and no issues under acceleration, even heavy acceleration.

Science is not always right in the real world. Way more variables there.