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Hello my C3 panel of experts.....

Can anyone tell me how can I determine if my lock-on gas cap is vented or not? My guess is that it might be an aftermarket type..............

mk's78
 

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...My guess is that it might be an aftermarket type...
Yep. Aftermarket. C3s did not have locking caps. Whether the cap is vented may be a moot point - most fuel tanks are vented.

Do you hear a pop of air rushing in when you remove the cap?

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Is there a name or number on it?
I have a dealer installed chrome locking cap on one of mine and an aftermarket Stant(sp?) on another, both unvented.
 
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