TODAY is a Great Day to visit our Store and order the parts you need for your truck!
I hate napa.
http://forum.73-87chevytrucks.com/smforum/index.php?topic=9072.0
Found it! It was the connector just inside engine compartment. Simply disconnected. Dual tanks work perfectly now. Thanks folks. Thanks for the diagram, already had it just didn't know what I was looking at.