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no name3's 1965 LeMans

2021 April
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Hello all, 

I just took my car out and noticed when I went to the gas station and took off my gas cap the tank was pressurized. Anyone have this happen? I did some looking online and can't find anything for an old car. Mine is a 1971 Lemans Sport with a Pontiac 400 Stoker. No fuel injection. 

Thank you! 

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There is a vent cap next to where the fuel goes in. I took it off and ordered a new one. It was probably clogged. 

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2 hours ago, Tom said:

There is a vent cap next to where the fuel goes in. I took it off and ordered a new one. It was probably clogged. 

More than likely the vent cap is the issue! Usually what you described is actually a vacuum, not pressure, but it happens so fast when you loosen the cap it seems like pressure. 

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