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Originally Posted by tom s

Scott,remember a vented cap allows air in,NOT out!I had a issue in a non vented tank when the air expanded in the tank and push gas past the needle and seat in my holley and filled a couple cyclinders.Was lucky that the engine locked up and did not fire.Pulled the plugs and it shot gas everywhere.I run that vented cap when driving the car but replace it with one I drilled a small hole in when garaged.My garage faces west and gets very hot in the summer.Someday I will brake down and get a new tank and put a vent in the filler neck.Its a 69 Bird.FWIW,Tom

Thanks for the info, Tom.

What would be the problem with me just drilling a small hole in my non-vented cap and calling it good?

Scott