where does factory fuel vent go?

[srea76]

I have an under bed tank and I am planning on buying a new bed floor. I can not justify cutting the new seals to make room for the blazer tank as well as the extra work needed to make filler etc. I have decided to go back factory and sale my blazer tank setup. One thing I have been wondering about this week is where does the vent tubes go on the passenger side of tank? I see them running up into cab pillars, but no idea where it goes and how they actually vent anything since the cab is enclosed.