I used to listen to the tank popping in and out in the summer while the car baked in the garage; it sounded kind of like somebody giving the quarter panel a good slap. I've got about the most convoluted tank ventilation system now, but it works. The main thing was getting a -8 rollover valve in the top of my tank, then giving the vapors a sufficient landing place; we had some good discussion about what works with Sean's Volvo project. A modern fueling system makes this problem way worse . . .
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