Charcoal / vapor / evap canister, how it should be set up and other information

mjck5 said:

been going crazy trying to find this kind of info online, i have an 86 k5 blazer that i swapped out the 305 with a 400, deleted most of the emissions stuff and have a after market edlebrock carb, this thread has help tremendously. thank you

i know this is a very old thread but im hoping this can get answered, i capped off the middle 3/8 connection, is it fine to leave the middle 1/4 tapped into the bottom 3/8 line, this is how it was stock

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Turbo4whl said:

Welcome to the forum Mark! It is customary for new members to add a picture of their square.

The charcoal can is okay, but most of us would like to see the truck it is sitting in. Shinny, rusty, whatever, we all like pictures.

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vphouger said:

Thanks for providing a detailed description. I'm looking to replace the canister on my 1986 C20 (P/N 17061005) but am struggling to find one. I appreciate anyone who might have some suggestions. Thanks.

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SirRobyn0 said:

How many ports are on the canister? There are a lot of specific P/N #'s that have been discontinued. These part numbers below will work in place of most of them, and if not a direct fit they can be adapted. If you have your old canister and can take a picture of it from the top I can tell you how to use / adapt one of these to work.

3 port canister (can be setup as 2) ACDelco PN#215-153 Standard Motor Products PN#CP1022

5 port canister (can be setup as 6) GM PN#17064627DS NAPA PN#CRB 229805

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SirRobyn0 said:

Thanks for the picture.
You can use the 5 port canister (can be setup as 6) GM PN#17064627DS NAPA PN#CRB 229805

The only difference is the 6th port, the solo port on the end closest to the radiator will have a cap on it that you'll need to pop off, and the port faces straight up instead of being at an angle, but it will work with no problem for your truck.

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vphouger said:

Would you recommend this 5 port canister over the 3 port one? I can find the 3 port one on Amazon. The 5 port canister is a bit more difficult to locate. Thoughts? ...and Thanks.

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SirRobyn0 said:

Well the 3 port will recover vapor from the tanks, but it would not perform the other funcations, bowl vent, A/F connection and it purges a little different. There are parts (designed for Chryslers) that will make a 3 port function like a 5 or 6. Let me see if I can find a 5 port and I'll get back on here and post again in a few minutes.

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SirRobyn0 said:

Here's one >>> https://www.ebay.com/itm/386101290581 <<<
But it's the only one I can find now.

If you wanted to use the 3 port canister, you'll have the option of hooking it up as described for the 3 port on post 4 of this thread or using an external vacuum controller (I can get you P/N for it if you want). Then I would TEE into the vacuum from the fuel tank and hook the bowl vent line to it. Plug off or remove the line to the air filter housing. Eliminate the smaller manifold control line if not using an external control unit.

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vphouger said:

Thanks.

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SirRobyn0 said:

Oh your pretty close to me, the shop I manage is in Redmond.

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