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smog canister

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by NoSmog73, Sep 30, 2001.

  1. NoSmog73

    NoSmog73 1/2 ton status

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    Well 2 questions in two days not bad huh.I have a 73 blazer (350) and I would like to know what the 3 lines that are at the smog canister do and can I plug up the 2 lines that go to the carb and the one that is the vapor return line with out any bad results on the carb (it is a rodchester carb) thanks for any help ya got.
     
  2. xnoahx

    xnoahx 1/2 ton status

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    I removed the canister from my 73 and i also removed the smog pump without any adverse affects

    My 73 K5 <a target="_blank" href=http://www.geocities.com/xk5blazerx/73k5.htm>http://www.geocities.com/xk5blazerx/73k5.htm</a> 350/TH350/NP203, Q-jet, Edelbrock intake, Vortec heads, 4" lift, and 36" TSL's
     
  3. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Its not some enviromental stangle hold to be honest. All it does it let your carb suck tank fumes instead of letting them drift out into the air. If you've the hook up down right you won't notice a difference with or with out it.

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  4. NoSmog73

    NoSmog73 1/2 ton status

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    I dont have a smog pump just the canister did they have the pump in 73 I thought it was put on the 74's
     
  5. jimmyjack

    jimmyjack 1/2 ton status

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    Mine hasnt been hooked up for years. Doesn't run any different. Like they said before it keeps the fumes from escaping into the atmosphere. The emission guy told me it was on the vehicle and that was good enuff for him!

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  6. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Your not going to gain anything by disconnecting it. Infact your carb is even less prone to the uphill problems some quads have if it has the vapor recovery line off the float bowl (fat line off top front of carb). put some new lines on it if they are old and hard and leave it be.
    You must have a cali model. My 75 has nothing but a PCV from the factory. The tank vents to atmosphere on top of the sender. sometimes if I'm in the back of the truck I can smell fumes. Wish my had the can. I worry that if a swamp it that I may get water in the tank.

    I don't need no damn shop manual, I got a pornographic memory.
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>
    75 Jimmy, Dollar
    Grim-Reaper
     
  7. Executioner

    Executioner 1/2 ton status

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    I had a 73 Blazer, was not Cali. had egr, canister, pcv, and GVW 6100 lbs.
    I think the key back in 73-77 to the emmision equipment was the GVW !
     
  8. beater74

    beater74 1/2 ton status

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    my 74 had a chester now it's a edelbrock and i had the canister on there untill last month, it's the big black can thingee next to the rad. on the drivers side. well now that i don't run a cester anymore i pulled out the can. and stuck a little k&amp;n filter on it be thats where my tank vents to. but if you are still runin a chester on there i'd leave cause it's not hurt'n anything
     
  9. Blue85

    Blue85 Troll Premium Member

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    The charcoal cannister is the main component of your "evaporative emissions" equipment, which is entirely independent of the engine emissions equipment. It just stores fumes from the tank and fuel bowl to be sucked back in by the carb and used in combustion later on.

    I think that large charcoal-filled screen thing that came in some of the air cleaners is also a part of this system, because since I removed mine (it's a restriction, after all...) I can sometimes smell a little gas in the garage.

    <font color=green>Does a Dyslexic Insomniac Athiest lay awake at night wondering if there's really a Dog?</font color=green>
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    Actually plugging the tank vent line, you'll need to change gas caps too. OIder non Evap cannister vehicles had gas caps that vented at lower pressure, newer vehicles with evap had higher pressure caps to make sure that the funmes went into the cannister, not out the filler neck. They will purge from teh cap, but at a higher PSI.

    I'm not advocating it, in any case, the cannister won't hurt anything, and why not burn the gas fumes instead of wasting them? : )



    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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