Well, after 20 years in this hobby I finally have a real hot rod. 1930 Model A Coupe that I picked up yesterday. Now I'm running down all of the things that the internet has made me paranoid about...the first item is that the tank is in the trunk with a vented gas cap. I am assuming the cap is vented because there aren't any other tubes or hoses coming off of it and it doesn't stall when you drive it. Seller (also a HAMBer) said he never smelled gas in the trunk and I haven't in the past day either. Anyway, here is a photo of the cap. The Moon customer service guy said they have two size caps- 2.25" and 3.5". I am guessing this is the 3.5". The caliper measured 2.625" on the bung under the cap. 1. Is it possible it only vents "in" - which would account for no gas smell in the tank? 2. I plan to run a vent with tip over valve through the trunk- anyone know how I would find a non-vented cap? Moon said they don't have them in the 3.5" size. 3. Any good tutorials on how they run these cool flip top caps up through the body so it wouldn't matter anyway? Like the photo stolen from Rodders Journal below? Thanks in advance.