K guys, getting ready to drop a fuel cell in the Camaro. I ran one in my 87' awhile back but had an interesting problem that I never figured out. On the vent line, I just ran a hose off a fitting to underneath the car (the picture is before I moved the cell under the car with AN line, this was just to drive it and test things out) but the cell "ballooned" on me, like pressure was building in the cell. The line wasn't clogged and it was below the fuel cell, any clues? I was going to run an aluminum version of the cell in this car but got a smoking deal on a 12gal cell in the "plastic" version. Any help would be appreciated as I don't want to go through this again.