DZGunner

I found the Y fitting for the charcoal canister was cracked, which was giving me a nice HC smell in the cabin. the charcoal canister also allowed the little pellets in the lines (i'm gonna have to clear them all out with compressed air).

anyways, I just saw a thread about dropping the CC to save weight. I'm not considering this for the weight savings so much as i don't want to spend $250 on a canister. So my question is: if it can be deleted, how is this done and what are the affects?

As for the Y fitting, i went to Lowes and grabbed a brass T fitting that fits just as well without the risk of breaking.

References to weight loss threads and the canister: https://rennlist.com/forums/2268939-post.html
https://rennlist.com/forums/928-foru...ight-loss.html

linderpat

DZ - what year is your car, and where in MT are you? I lived in Bzn.

DZGunner

****, sorry forgot to add that, please don't hurt me.

1987 S4 I'm in laurel, it's near Billings if you weren't sure

dr bob

Without the CC you'll need to find a way to safely vent the gas tank. You can't plug the vent line or the fuel pump will suck the tank into a small prune. Leave it open and you'll enjoy the same fuel smell you have now. Recommendation: Ask around the group for a spare used one (they don't "wear out"), or get one from 928 International.

The cannister is HDPE, and can be plastic-welded in a pinch, or repaired with JB Weld. You can make new nozzles/nipples out of copper tubing and glue them in, but use flexible vent hose rather than that now-rigid plastic stuff so you don't strain the repaired joints.

DZGunner

I think it was ducman that said he vented it straight from the gas tank at the back of the car so he didn't get the HC smell. I just don't know exactly what port he vented from and where he safely routed the tube for it.

dr bob

An open tube is an open tube, so you will always get vapors out of it unless it's really cold. Ducman has a wonderful car that he won't be able to register in most states if his vent is discovered, including the one he's moving to. There's absolutely no performance downside to keeping the CC intact and functioing, and it's alomost always easier than trying to find other more creative ways to allow air to pass in and out of the tank.

DZGunner

There are no emission tests in Montana (yet). I guess the problem stems from the fact that I tried the used canister route, and it turned out to be bad too. As soon as I took it out of the box it was pouring the charcoal from the tubes. I pretty much got F***ed. So I don't really trust anything used, which is why i was going for an alternative to that.

Kevin in Atlanta

I have a used charcoal canister from a 50k mile S4 you can have for 50 dollars shipped.

The Fixer

Vented gas cap

I have always tossed my charcoal canisters they are very heavy and of no use to me, never had a single problem.

My understanding of charcoal canisters:
An evaporative canister is part of the evaporative system that is within the emission system. Hydrocarbons are released by gasoline as it evaporates or after it is burned. While fuel is stored inside the tank, fumes build up and are retained inside this canister. The canister contains charcoal that absorbs the hydrocarbons. When the engine is started, a valve opens that allows fresh air to come in and purge the fumes (hydrocarbons) into the air intake and then into the combustion chamber for burning. I understand that more hydrocarbons are released into the atmosphere by leaving your fuel cap off, than what comes out of your tailpipe while the engine runs.


DZGunner, If you want to really get technical, punch a tiny hole in the rubber gasket and vent your cap. I haven't ad an issue and did this last May.