86 dual tank help

[superwade57]

i have an 86 2wd swb silverado bought it in 2005 with "a blown head gasket" its been parked for years and i finally got around to doing something with it turns out cyl #1 is hatched bad, long story short ive never had the truck running put a good motor in over the weekend and no fuel delivery, it has a clear fuel filter and i can see no fuel is getting to the carb it has a dual tank system and i cant find anythign in chiltons manual about them at all, switch feels funny so i removed it, dont know what wires are what in the dash or if the actual switch on the frame could go bad or how its wired??? im pretty frustrated with this whole situation please save me before my head explodes.