Vented fuel tank Caps?

[1980Cougar]

The previous owner told me that he replaced the gas caps on my Cougar with flip-top stainless caps. I've noticed that my tanks don't vent at all right now and I don't want to crack them. Do they make flip-top caps that are vented? Can I drill a vent hole in mine?

[Legal Chemistry]

Yup, they do make flip up caps that vent...

[superdave013]

Yup, they do make flip up caps that vent...
and they just have a small hole drilled in them. Drill a small hole in the ones you have and you'll be set.

[Rexone]

Some of them don't "look" vented but are. They vent in the gap around the screw hole when the gasket is depressed (closed fill). Take a fill off and try to blow through it. A small hole like SD said works good too as an only vent or in addition to above.

[1980Cougar]

Thanks guys!! I'll try drilling mine out.

[Bradf]

Er, just a reminder... hot metal shavings + gas = b00m... then again, that would also fix your venting problem.