Apparently the 09 Cambria doesn't have one. Putting in fuel today, the pump clicks off then I pull the nozzle vapor seal back and put in another 7 gallons. Poor design.
We don't RV in CA with our Class C so we haven't used those sealed nozzles. But I know we DO have a vent line from tank all the way back to the filler plate. Do you know you don't have one? Ours wasn't run right, compared with how the filler pipe ran, and was hard to fill. I rearranged the two and improved the situation. But it's not a Winnebago and it's not in CA...