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Just ran into a guy with a 69 Chevelle. 307 auto. When he has a full tank of fuel and the engine is hot the tank overflows from the vent. I read a post on this subject earlier and can't do a search top find it. The tank is a new tank with a double outlet on vent. He has a vented cap that locks. Could that be the problem ?
 

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Don't know if a 307 has the same setup as my car Tom but here's what I have.

Single fuel line from tank to fuel pump. I know some engines also had a vapor return line running the same route. Mine has the dual vent lines from the tank into a plastic "Vent Surge" as identified in the assembly manual. Mine also has a non vented cap, don't know if all models were the same.



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ACES #4241, TC #947
69 SS Sedan
 

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I am experiencing the same thing with my '69. Non-vented cap. If I fill the tank, run the car for a bit, then turn it off, it'll leak. I now just loosen my cap to let the pressure out of the tank and it seems to help, although it's been a while since I filled it plump full. (85 cents/litre will do that to ya).
 
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