charcoal cannister??

[m1000snopro]

Hey guys I was wondering if I could get some info on what the canister does for vacuum on the TBI and fuel system I know very little about it thanks fellas

 

[firebane]

For vacuum? Nothing.

The engine creates a vacuum inside the canister to purge gas vapors.

 

[chengny]

The complete section on evaporative emissions - from the 1987 Emissions & Driveability Manual:

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Note the high altitude and non-altitude versions - may be a factor if the truck was originally sold for use in certain parts of Colorado.