Vapor Canister - S-10 Forum
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Vapor Canister

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Old 08-18-2008, 10:03 AM   #1
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Vapor Canister

There's a "vapor canister purge valve" on the truck's intake.
It gets an input from a fuel tank line and the other end plugs
into the intake. Where the heck does the "vapor canister"
come into play in all of this? My intake is removed now, but
I don't recall seeing anything that connects to the canister?
Old 08-18-2008, 10:13 AM   #2
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Re: Vapor Canister

um on my first gen 2.8 if ur talkin about the lil coffee can lookin thing.....there is something that runs from the tank to it then a small line that runs from the intake manifold to the canister
Old 08-18-2008, 10:21 AM   #3
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Re: Vapor Canister

Quote: Originally Posted by OneLowSdime
um on my first gen 2.8 if ur talkin about the lil coffee can lookin thing.....there is something that runs from the tank to it then a small line that runs from the intake manifold to the canister
On my truck the valve is fed from a hard line behind the intake.
I'm -assuming- that was coming from the fuel tank, but maybe
its coming from the evap canister? Someone must know...

If, indeed, its coming from the canister, why is it a hard line?
Old 08-18-2008, 10:22 AM   #4
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Re: Vapor Canister

ummmm ill check wiht my buddy with the 4.3 when he gets into work
Old 08-18-2008, 10:22 AM   #5
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Re: Vapor Canister

On my W motor the purge valve is a round plastic disc shaped item near rear of the drivers side valve cover. The 2 main connnections are (1) to a hard line that comes up to the rear of the drivers side head. This line goes to the vapor canister way in the rear of the truck. And (2) to a hard flex plastic line that connects to a rubber elbow to a vacuum tip just under the throttle body. This establishes the path for vapor in the canister to go to the intake when the purge valve is open which happens via the 3rd connection, which is a thin flex plastic tube that operates the purge valve diaphragm. This connects to a vacuum Y on the rear of the passenger side of the intake.
Old 08-18-2008, 10:54 AM   #6
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Re: Vapor Canister

Here is what my evap valve looks like...



Mounted on the pass side of the intake manifold. Only 1 input,
a hard line behind the intake by the firewall, and the bottom is
plugged directly into the intake manifold. And the wiring plug.

I thought my evap canister was in the driver side fender, but is
it possibly in the rear of the truck and the hard line I'm seeing is
actually coming from the canister?
Old 08-18-2008, 12:26 PM   #7
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Re: Vapor Canister

Definitley not like the setup on my 1994 W motor. Someone else will have to chime in. It might help to specify year and motor since these systems seem to vary a bit.
Old 08-18-2008, 03:16 PM   #8
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Re: Vapor Canister

Oh, sorry, my truck is a '99 S10 4.3.
Old 08-19-2008, 09:35 PM   #9
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Re: Vapor Canister

Canister on the 1998 Blazer is in drivers rear of truck, little squarish can with a few hard lines going to it, can see behind drivers rear tire (I think it is inside the framerail if I remember.)
Old 08-19-2008, 11:24 PM   #10
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Re: Vapor Canister

Quote: Originally Posted by lesterl
Canister on the 1998 Blazer is in drivers rear of truck, little squarish can with a few hard lines going to it, can see behind drivers rear tire (I think it is inside the framerail if I remember.)
Bingo. I now see where it is. Thanks!

Not sure why I was thinking it was in the driver side front fender?
Old 08-19-2008, 11:47 PM   #11
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Re: Vapor Canister

They call it a Charcoal Canister, just FYI. Most older 1st gen truck were in the front fender.
Old 04-12-2012, 07:40 PM   #12
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Re: Vapor Canister

I have a code p0446 and got a print out they said somthing about the fuel might of saturated the vapor canister so i am guessing it would be good just to replace that unlesss there was a way to fix. hopeing it si not a hard fix just need to know where it would be located on a 98 s10 4wd.
Old 04-13-2012, 01:31 AM   #13
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Re: Vapor Canister

its not that easy for liquid fuel to get inside the canister.
P0446 is a "vent" valve issue.
if its a pickup, the canister is just above the rear axle, drivers side.
the vent valve is above the center of the axle housing, with a hose
attached to the charcoal canister.
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