Charcoal canister layout on Subaru powered 72 Bay?

[a57oval]

Calling all Suby swap guys,

I am installing a Subaru SOHC 2.5 engine and Subaru 5 speed manual transmission with a flipped 4.44 Ring and Pinion from an 2004 forester into my 72 Bay. I have most of the mock up done but am a little confused about the evaporation emissions system.

My gas tank which started out as a stock 72 tank has been modified to accept both sending units from the Subaru Forester tank. I am using the stock Subaru fuel pump and the the stock Subaru fuel sending unit to power Subaru gauges. Picture of the tank as modified:

I am using a Small Car interface board to alleviate know fault codes associated with this type of swap.

Below is my proposed vapor recovery system:

As i understand it this is my vapor recovery system in stock form:

Picture of my proposed Charcoal canister:

But i have some questions:
1) Can I run a hose from #9 in the stock diagram to the port marked "tank" on my proposed charcoal canister.
2.) Can I run a hose from the the purge valve metal line on the engine to the port marked "Purge" on my charcoal canister?
3) I am using a Stock 2004 Forester air cleaner: If I connect the port marked "exhaust" on my proposed charcoal canister to the air cleaner would that work? Makes vapor system completely enclosed, yes?
4.) Is it ok to tie the "exhaust" port of the charcoal canister into lines from valve covers to air cleaner?
5.) By doing it this way, doesn't the system get constantly drawn on when running? Is that ok? Would it draw too much?
6.) As designed with the stock Subaru sending units and the Small Car board would this system "Purge" just like a stock Forester? Do I care?

As you can see I am confused about how the system works. I really would like to have the the whole vapor recovery system enclosed if possible.

Thanks for any help you can provide,
Peter

[RocketSurgeon]

I'm working with a 99 2.5. I'm going to try and use the Subaru canister. Just a vent from the tank to canister and purge from canister to intake. Just let the purge solenoid on the manifold control flow. I guess I'll find out if it works once I get it in and running
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69 Westy

[a57oval]

Thanks Rocketsurgeon for the reply. I plan on doing the same thing basically. My biggest concern is hooking the exhaust port of the canister to the air cleaner. This would create a constant suction on the canister. I am worried that may an issue but honestly don't have a clue. This is my first foray into this sort of thing,
Peter

[captincanuck]

If you are installing all the EVAP stuff and the level sender with thermometer, then why even bother with the small car board? It's for fooling the ECU into thinking you have these things installed, which you do! Maybe i'm missing something?
If I were doing this (which I am ) I would also follow the Subaru system the way it's set out, using the Subi canister.
I don't really know enough about these systems to give you any advice, but your question about the "system being constantly drawn on" causing a problem? I think this is prevented by the presence of the dump valve in the system. But don't quote me on that
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1979 Westfalia "FireFly" Subaru 2.2 with Subaru gears 5spd.
Build Thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=634777&postdays=0&postorder=asc&start=0

[skills@eurocarsplus]

first, why on gods green earth would you use an integra canister?

second, I replied to your p/m....thanks for the thanks anyway

third, if you plug or hook up your "exhaust" you will have effectively shot yourself in the foot.
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[Elvisbarnsley]

Just done it myself you don't need the charcoal canister,ask at Subaru garage

[a57oval]

capttincanuck,
Thanks for responding: I am not using all of the Subaru EVAP stuff. The only things I am using are the factory Subaru fuel pump and both sending units. If you look at my tank you will see that there are no provisions for the other EVAP stuff. This is why I need the Small Cart board. By dump valve do you mean the Fuel tank Pressures sensor, the Fuel tank sensor control valve or the Fuel temperature sensor? These are the 3 sensors I do not have installed in my tank that I need the Small Car board for.

Skills: Thanks for responding:
Why use an Integra canister?
1.) it has the same size port for gas tank venting as the VW vent lines
2.) It has the same size "exhaust" port as the intake ports on the stock Forester Airbox and valve cover venting.
3.) It fits well under the bus in an indiscreet out the way position.
4.) It is much newer than my VW canister and thus far easier to replace in the future if need be.

You say "third, if you plug or hook up your "exhaust" you will have effectively shot yourself in the foot." Can you expand on that?

If you look at the drawing, it was not my intent to plug the exhaust port of the charcoal canister. I was thinking that I would plumb the exhaust port into the valve cover venting of the engine that runs to the air cleaner housing.

Thanks again everyone for offering up your expertise.
Peter

[captincanuck]

By "dump" valve I was talking about the Subaru drain valve, which I thought would be equivalent to the valve that is on your canister. But I see you are not using the purge control valve and your system as its planed out is closed.
Not to sure how or if this is going to work. I'm no expert.
Good luck.
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1979 Westfalia "FireFly" Subaru 2.2 with Subaru gears 5spd.
Build Thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=634777&postdays=0&postorder=asc&start=0

[pkrboo]