Two-port Fuel Vapor Canister Recharge/Refurbish
- Thread starter 69hurstolds
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The foam under the plastic bottom and the top of the canister. The carbon sits between them. After the bottom is cut off, and everything is removed, the top foam goes in first, then the carbon, then the other foam, the push in plastic retainer, then you glue the bottom ring back on.
Here's the basic construction below. It's important to ensure that there is no slop in the canister carbon. In other words, the canister must be full enough to ensure the vapors are forced to vent into the carbon bed through the upper filter and not bypass the carbon at the top. If not enough carbon is added, that's exactly what it would do. It doesn't have to be crunched in there, but the foam is there to absorb any potential liquid fuel that makes it to the canister, condensed or otherwise. Believe it or not, the canister gains a little weight (milligrams) as the fuel vapors vent to it, and when the engine is started, those vapors get sucked back into the engine, reducing the weight again.
Yeah, that would be about right. Around here the bottom replaceable foam filters used to be available but not sure anymore if their part number is still good or defunct.
Nick
Nick
THANK YOU for the detailed descriptions of the canister job and the photos! I think for now, due to time limitations, I’ll only replace the bottom filter. I believe you said that the filter just pulls out? If so, what keeps it in place?
THANK YOU for reposting your canister refurbishing job! Due to time limitations, I’ll replace the bottom filter for now. If I read your description right, you said it simply pulls out? What holds it in place, if anything? The photo on the left is the current filter, the right one is the one I got at a Napa store. Is this the correct filter?
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Pull the old one out, and poke the new one in. It APPEARS to be the right filter, but the quarter doesn't give much of a reference. The filter is a friction fit underneath as you have to push it into place around the lip edge. You'll see when you yank the old one out.
Now, if carbon bits pour out, the canister retainer foam is toast, and you're likely going to have to replace the thing, or recharge it if you're crazy like a few of us.
Now, if carbon bits pour out, the canister retainer foam is toast, and you're likely going to have to replace the thing, or recharge it if you're crazy like a few of us.
The retainers or hold downs for the canister are two tabs, you can see one of them in IM6318 posted above. The canister sits in a pocket, possibly in the left side inner fender well, like mine does, and there are two threaded bosses, 180 degrees apart, into which a couple of 6-8 mm self tapping screwes get inserted, to hold the whole thing down.
Nick
Nick
Thank you!
The filter just “fits” in there?!
Crazy! I’d think they’d have a way to lock it in, a retaining “cage” or similar. I’m concerned that the filter I got may not be the right size—I’ll measure it. I’m guessing that the carbon retainer foam is bad. Before I do anything to it, I’ll look around for a replacement canister. Doing the restoration of the canister will be more of a challenge than I want to deal with at this time.
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