crome gas cap leaking

[covert]

I've bought two differant crome gas caps and they both leak from the top vent hole . What can I do?????????

[pedhead7]

Your supposed to take the one way valve out of the stock gas cap and put it in the cap you bought

[covert]

It doesn't fit

[Slimcandy428]

You have to pop it into place by pressing the valve into the cap.