okay, heres the question i have. i have a grubee engine, with a normal black teardrop tank and a normal gas cap, i noticed that the cap vents, the tank doesn't, so how do i find a cap that has no vents and is completely airtight so i can use it when i store it somewhere that gas fumes are an issue? its essentially so i can store it in an apartment, i have a petcock valve that seals the fuel's exit to the carb completely, so now im just trying to figure out how to seal the cap hole completely. also im aware i cannot ride with a non venting cap due to the vacuum that would be created, it is for storage.(please refrain from posting safety concerns, it will be at a consistent temperature with no flames, sparks, or electricity near it. this is not posted on the safety section of the forum.)