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Re: Project 67 DRGNWGN - 67 Burban!!
I believe that the last vent line should go to the fuel evap system in the OE application and through the charcoal canister it would vent the tank. This would be in a system with an unvented gas cap.
The large vent is used to vent the tank during fill up.
You may want to look at some later model Burbans and investigate how they vent their fuel tanks. Maybe you will be able to incorporate some of those components in your truck and enjoy the benefits of a unvented fuel cap.
Keep up the good work.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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