To vent or not to vent - Emissions Canister

Discussion in 'The Mixing shop.' started by 73 Stage-1, Apr 30, 2023.

  1. 73 Stage-1

    73 Stage-1 Dave

    Trying to determine if the emissions line (emissions control pipe – third line from the tank) that used to go to the Emissions Canister needs to be plugged or should remain vented to the atmosphere.
    And, would this have an effect on whether the fuel cap should be vented, or not?
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  3. 1973gs

    1973gs Well-Known Member

    I used a late 80's canister on mine. I just ran the hose into the bottom of the air cleaner assembly, between my throttle bodies. I have a sealed cap from the same era and have had no issues in 8k miles. An advantage to using a vapor canister is that I have no fuel smell in my garage as a lot of older cars do. I have no other venting on my tank.
     
  4. 73 Stage-1

    73 Stage-1 Dave

    Gotcha - thank you both for the replies. The original underhood line was tucked away behind the fenderwell. Trying to de-clutter and clean up the engine compartment, and came across the line.
    @1973gs - do you have a photo of the 80's canister you used?
     
  5. 1973gs

    1973gs Well-Known Member

    I'm 99% sure that this is from a 1989 S-10 2.5l, # 17113148 but looking on RockAuto, it shows a different image. Actually, RA seems to show the same canister picture Vapor canister.JPG in many applications. At any rate, you'll need one that has 2 3/8 or 5/16 nipples, not one with a vacuum port as shown on RA. The part # on mine is 17075849, but numbers cast or molded on GM parts aren't always the actual part number.
     
    73 Stage-1 likes this.

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