Charcoal evap canister

[Bradf68]

I have an LS3 in a 68 Camaro with a vent in the tank to the atmosphere. I want to install a rollover check valve and possibly a charcoal canister to decrease gas smells in the garage. Heat and open gas tanks in Mississippi in a closed garage do not mix well. What are you guys running for a charcoal canister and where are you mounting the rollover valve/canister?

[raustinss]

II much https://www.iimuch.com/collections/fuel-differential-vents for vent . Not too sure about a rollover valve set up

[Tsaints1115]

I used a stainless steel Thermos,some fittings, and charcoal filter discs. One fitting pulls any vapors and the other exits out a hole to the roll-over valve in a hidden location outside the car.

204285

[Poncho72]

I used a stainless steel Thermos,some fittings, and charcoal filter discs. One fitting pulls any vapors and the other exits out a hole to the roll-over valve in a hidden location outside the car.

204285

great idea, can you provide details of the internals. i am in a similar situation.

[Tsaints1115]

great idea, can you provide details of the internals. i am in a similar situation.

The fittings are just brass bulkhead style, 3/8" if I remember correctly. The vent side has a piece of fuel hose on it that stops 1/2' or so from the bottom. The charcoal filters are for coffee makers. Poke a hole in the center and stack them over the internal hose. The fuel vapors from the tank are forced through them before they can escape the vent.
Thread the lid on and you're all set.

[streetk14]

I’m not sure if this is common or not, but I get ZERO fuel odor in my garage with my stock replacement tank and vented cap. Occasionally I’ll get a hint of fuel odor while driving that I can’t ever seem to locate. I suspect it’s from vapors getting into the trunk, so I need to look into that.

That said, I had fuel odor issues in the garage with my ‘67 that I never fully resolved. Could have been the type of fuel hose I was using, or the cheap cork gaskets the Rock Valley tank I had used. Both cars had a vented cap, so I know that’s not it. With my factory steel fuel line and a couple small sections of Earl’s Vapor Guard, my ‘68 has no odor.

I’m not saying a charcoal canister is a bad idea; but if you have odor issues while parked, you could have another issue that’s causing it.

[ULTM8Z]

I’m not saying a charcoal canister is a bad idea; but if you have odor issues while parked, you could have another issue that’s causing it.


Yeah, the wrong kind of braided rubber line can allow for vapors to permeate through the rubber. I wrestled with fuel-like odor in garage for years before I figured it out (back around 2008 IIRC). I had braided line running from tank to fuel rail.

Ended up switching to braided teflon line and that solved it.

As far as charcoal cannister, why can't a stock '68 cannister be used in the stock location up front? It'd operate independent from the PCM, but they originally just ran on engine vacuum anyway. No?

[streetk14]

Yeah, the wrong kind of braided rubber line can allow for vapors to permeate through the rubber. I wrestled with fuel-like odor in garage for years before I figured it out (back around 2008 IIRC). I had braided line running from tank to fuel rail.

Ended up switching to braided teflon line and that solved it.

As far as charcoal cannister, why can't a stock '68 cannister be used in the stock location up front? It'd operate independent from the PCM, but they originally just ran on engine vacuum anyway. No?

Did they even have a factory charcoal canister in 1968? I thought they just had a vented gas cap, but I could be totally wrong.

[79 Camaro]

A cheap way to do the roll over valve is contact a dirt track race car supplier. Race cars like that have to have a roll over valve. They are a simple little plastic thing that goes into the end of a rubber fuel line. I think they are less than $10.

[Poncho72]

thanks for the replies, i have installed teflon braided line from tank to rail ( and the return) and i have a roll-over valve. i was have a time trying to find a location to mount the roll-over valve, and just want to minimize/eliminate as much fumes as i can.

[ULTM8Z]

Did they even have a factory charcoal canister in 1968? I thought they just had a vented gas cap, but I could be totally wrong.

Good question. Not sure. If not, could grab one from an early 70's car. My '71 had one. I ended up putting in a 3rd gen Camaro one with the electric solenoid years ago when I swapped in the TPI.

[cpd004]

I have a Finch canister. Not sure if it'll fit what you're looking for:

http://www.finchperformance.com/

[fountain4ever]

Unfortunately the II Much ones do not work. They do not have any charcoal media inside them. I found the one one on the market that currently works is the Vapor Trapper. It is a beautiful piece and it worked immediately!

[dhutton]

Unfortunately the II Much ones do not work. They do not have any charcoal media inside them. I found the one one on the market that currently works is the Vapor Trapper. It is a beautiful piece and it worked immediately!
Are you sure about that? I thought the iimuch canister was designed to condense the vapors in the canister and return the condensed fuel to the tank. Have you actually used one or are you just here to sell your charcoal canister?

I saw you got booted off the Camaro forum today for doing the same thing…

Don

[dontlifttoshift]

No way, the boat guy joins the forum pimping the designed for boats charcoal canisters. What a coincidence.

The problem that the vapor trapper doesn't address is it does not separate the liquid from the vapor. If you push liquid fuel into a charcoal canister, it's junk and needs to be replaced. That is why tanks got vapor domes shortly after they started adding charcoal canisters. Before the vapor domes there were separators mounted above the tank that then fed the vapors into the canister.

[srode]

i thought Charcoal Canisters needed to have a vacuum pulled on them periodically to prevent the charcoal from being saturated making them ineffective.

[Hotwire]

I've got a Tanks Inc tank with internal pump and have fuel coming out the vent. I've been trying to figure out a burp tank and charcoal canister to keep fuel smells down like you.

The tank has 2 vents that merge to one, want to hook this up right outside the tank:

https://www.perko.com/catalog/fuel_system_components/155/air_fuel_separator/

Then run the output to this, just haven't found a decent way to mount\run everything.
https://www.perko.com/catalog/fuel_system_components/1079/carbon_canister/

[ULTM8Z]

Here's what I did on my Tanks unit. Pictures below. I get absolutely no leaks or fumes.

On the NPT fitting, I installed it so it facing down into the filler neck (not necessarily at 12 o'clock position) since it would interfere with the body. Probably around the 10 o'clock position. That way if fuel sloshes up the filler neck on acceleration it won't get sucked into the line (unless it completely fills the filler neck up to the filler cap (which doesn't appear to have happened as near as I can tell).

The vent valve is off a thirdgen F-body. I simply created a L-bracket and mounted it to the chassis above the fuel tank, then routed the hose to it.

I had initially used the steel ball check valve that Tanks supplied with the fuel tank and it vented the tank just fine during operation, but the problem was when the car was off and parked in the garage, it bled fuel vapors. So I decided to integrate the factory third gen Camaro CCP system into it.

https://www.pro-touring.com/attachment.php?attachmentid=141893&d=1499099360


https://www.pro-touring.com/attachment.php?attachmentid=141894&d=1499099372


https://www.pro-touring.com/attachment.php?attachmentid=141895&d=1499099685

[thedugan]

Any issues when filling the tank where the fuel purps back?

I like that third gen filter. Nice setup.

[ULTM8Z]

No issues like that. Fills up normally at the gas station.

I run a non-vented gas cap too BTW. I can get home after driving on a very hot day, open the gas gap and get no hissing or "wooshing" or anything like that, indicating I'm neither generating pressure in the tank nor pulling a vacuum in it.

The "mushroom" vent valve (as its commonly known on thirdgen.org) will momentarily in open up to flow in the other direction if enough vapor pressure from the tank is applied to it (couple of psi I think). But nominally it only allows fresh air into the tank as the engine vacuum pulls fumes out through the canister. The canister has an electrical solenoid that's controlled by the ECM.