Join Date: Mar 2012
Location: watsonville, ca
I will check. There are 2 small holes in the top of the tank. Isnt one the breather hole for expansion?
As standard that hole has rubber washer and links to the cap to vent from what i can tell. With qr cap it just sits there open so i prrsumed petrol could come out of it?
I checked the '11 g4 cap; the overfill exit hole is outside the cap gasket seat area. That is the only hole.
edit: after re-reading your original post about the two holes UNDER the cap, I checked my above oem cap and it has one hole under the cap BUT still inside the gasket area that must seat upon the top of the filler cap. Has to be same with your new cap but either the gasket is missing or wrong size. Hope this helps.
Last edited by scout; 09-09-2017 at 02:52 PM.