I have been driving my 67 Camaro about every other day 50-60 miles and I noticed a fuel smell inside. I have all new hoses and clamps and gas tank seal and such fine. After a longer drive I stopped at a parts store and as I walked away from car I heard a "tea pot whistle " pitched sound. It was coming from fuel cap and I released cap and it had a great deal of pressure. The vapor smell was exactly what I have been smelling. I can drive the car 5 miles and cap has pressure, what is wrong? ???
The vent is clogged.
From the piss they call gas these days.
Amen on the piss they call gas. It's pathetic.
The cap contains a 2-way vacuum/pressure valve which allows air entry to replace the volume of fuel used so the tank doesn't build a vacuum (which can result in fuel starvation or partial collapse of the tank), and allows pressure relief at a certain pressure level to avoid distortion of the tank. Both sides of that valve need to be working.