Hot air and gas smell coming in from the cab

[hatzie]

You can get the basic three hose vapor can and the five hose can.
Three hose is Standard CP1022
Five hose is Standard CP1004

[1979SIERRAGRANDE]

You can get the basic three hose vapor can and the five hose can.
Three hose is Standard CP1022
Five hose is Standard CP1004

Occasionally, they come available.  Post the number cast into the top of the canister.

The ones i have in the truck right now is one 5 inlet and 3 inlet thats close to 350 dollars shipped any way i can just remove the canisters and run a breather to the vent hoses for the fuel tank ?

[hatzie]

Where are you pricing that... your GM dealer?  No way the evap can costs $350.

If it stinks of raw fuel now it'll be worse without the can.

Brand New AC Delco 215-151 five hose evap can is $103 on Amazon with Prime shipping.   https://www.amazon.com/dp/B000C9K1DK
The five hose Standard CP1004 evap can costs $135 on Amazon.
If you don't have to pass emissions just get the $55 three hose can...

Three hoses to hookup.
1 - Purge Tee into the PCV valve hose.
2 - Purge vacuum signal from ported vacuum.
3 - Vapor from the tank. 

Cap the other two vacuum lines and leave it.

If you google the standard motor products or delco part number you'll probably find better prices.  I was being lazy by just checking Amazon.

[1979SIERRAGRANDE]

 

Where are you pricing that... your GM dealer?  No way the evap can costs $350.

If it stinks of raw fuel now it'll be worse without the can.

Brand New AC Delco 215-151 five hose evap can is $103 on Amazon with Prime shipping.   https://www.amazon.com/dp/B000C9K1DK
The five hose Standard CP1004 evap can costs $135 on Amazon.
If you don't have to pass emissions just get the $55 three hose can...

Three hoses to hookup.
1 - Purge Tee into the PCV valve hose.
2 - Purge vacuum signal from ported vacuum.
3 - Vapor from the tank. 

Cap the other two vacuum lines and leave it.

If you google the standard motor products or delco part number you'll probably find better prices.  I was being lazy by just checking Amazon.

i checked amazon i have two evap cans i guess one for each tank

[1979SIERRAGRANDE]

Thanks again guys for the quick responses i have been getting this forum rocks !  

[NCali]

 used to see the canisters blow out carbon pebbles and cover the fender thats why i decided to change the filters

  wouldnt that suggest that you are getting pressure from some source blowing into the canister? like a fuel line from the selector valve connected to the wrong place filling the canister with fuel
My canister has a vacuum line and a vent line , but nothing that would cause fuel to fill the canister or pressurize it

[bd]

used to see the canisters blow out carbon pebbles and cover the fender thats why i decided to change the filters

  wouldnt that suggest that you are getting pressure from some source blowing into the canister? like a fuel line from the selector valve connected to the wrong place filling the canister with fuel
My canister has a vacuum line and a vent line , but nothing that would cause fuel to fill the canister or pressurize it

The "filter" is a fresh air inlet filter to prevent dust from being drawn into the canister by engine vacuum.  The activated carbon granules contained inside the canister passively absorb fuel vapors that evaporate from the fuel tank(s) and the carburetor fuel bowl and then gradually migrate into the EVAP canister through a physical process of partial pressure equilibrium.  While the engine is running, fresh air drawn through the canister filter and across the carbon granules only partially purges the fuel vapor that collects in the canister.  A trace amount of fuel vapor remains permanently bound to the carbon granules.  Eventually, the carbon granules saturate with fuel and the canister loses its effectiveness.  This is normal over the useful life of the canister. 

Rarely, a canister purge valve diaphragm perforates, exposing the tank and carburetor vent lines directly to engine vacuum.  In such cases raw fuel can be drawn into the canister resulting in immediate saturation with fuel dripping from the canister.  In this situation the canister is rendered instantly useless. 

In either scenario, the heat necessary to totally drive fuel from carbon granules and restore the effectiveness of a canister would destroy the canister - not-to-mention the extreme hazard of heating the fuel in the first place.  The only solutions are canister replacement or elimination.  The consequence of elimination is noxious fuel odor, especially on warm days.

Carbon granules leaking from an EVAP canister can be a problem caused by failed internal baffles/screens or liquid fuel floating the carbon granules out through the vent lines.