Yesterday went to a buddies to help him stain his deck. Brought my Russian 91 on my mech mod, and my Vivi Nova on my VV/VW ego. Left the Russian in my car inside my backpack pocket as this was just to heavy to use whilst staining. After about 5 hours when I went home, I went to take out my Russian, and I could smell the juice. I thought to myself Oh no my juice leaked, and sure enough it did. I leaked about 1.5 to 2 ML (I could tell by how much was left in the tank) out of the air hole. It has never leaked before, and did not leak once I whipped it off, and got it home. I have heard of pressure changes making them leak such as with a plane trip or climbing Mt. Everest . Has anyone had this happen to them, or was this just a fluke? It wasn't even that hot out only about 80, and probably about 90-95 inside the car.