sorry man i was wrong. the tube is part of the evap system and connects to a metal tube that runs along with the fuel lines to the tank. so the sensor the tube goes to is some sort of vacum valve.
I took a bunch of pics with my digital during the taredown just incase i forgot where stuff went and labeled every plug i un did even tho most will only go in one place.
Quote:
Originally Posted by glock35ipsc
OK, thanks. I though I disconnected wires from both of those, so I'll have to look again tonight.
No one makes a manual for a 5.3 Vortec in an 85 GMC. 
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