I'm contemplating whether I want to try and convert to the newer style (rectangle) charcoal canister that is in the back of the car vs. the older cylindrical canister in the engine bay. I have not seen the newer rectangle canisters mounted and in the car, so I was looking for some pictures of where exactly it is mounted under the car in the rear and how it's mounted.

 

Here's a picture of the rectangular canister and filler pipe from a craigslist add. I'd like to see how it's installed under the car.

 

Thanks

 

This is a big can of worms andnprobably won't work correctly without an ECU swap and changing all of the solenoids that go along with the evap system at the back of the car.

Is there a really good reason for wanting to switch?

I'm running a stand alone, so I'm not worried about the ECU.

 

I'm looking at this due to how the old turbo Legacy evap system has both the main purge valve and an auxiliary purge for the canister while the new systems only have the main purge valve. Granted the new systems do have quite a bit more stuff associated with them, but what I'd like to play with is combining certain pieces from the new system with the old.

 

Under certain circumstances, mainly when it's hot (which it is quite often in Houston) the main purge on the charcoal canister doesn't keep up with the fuel vapors coming off the tank if I'm in boost a bunch. Due to running a different airbox and custom intake setup I don't have the auxiliary purge installed.

 

It may not be easy to do and have its own challenges, but like everything else I've done on this Legacy almost nothing is stock and everything has required a fair amount of customization to make it work

 

My first question is whether I can physically fit the new charcoal canister in the car. If I can't do that I won't even bother looking into things further. So this is why I'm looking for some decent pictures on how things are installed on the car.

 

Thanks

Under certain circumstances, mainly when it's hot (which it is quite often in Houston) the main purge on the charcoal canister doesn't keep up with the fuel vapors coming off the tank if I'm in boost a bunch. Due to running a different airbox and custom intake setup I don't have the auxiliary purge installed.

You may be missing some heat sheilding between the exhaust pipe and the fuel tank.

 

The round canisters are supposed to vent to air via the funny loop hose that sticks into the frame under the canister.

The newer ones vent through that giant round filter that mounts above the canister box.

You have a purge valve at the front mounted under the manifold. That should be normally closed. Then there is a vent valve at the back which is normally open. That vent valve allows the tank vapors to flow into the canister. When the purge valve opens the vent valve is supposed to close so the vacuum can draw any condenser vapor out of the canister. Then the ECU has some algorithm that closes and opens the valve in a cycle to draw vacuum on the fuel tank. It then checks tank pressure via either a rear mounted dedicated fuel tank pressure sensor, or through the PSSSV and MAP sensor combo on the strut tower (dependent on year and engine type).

 

I can get pics of the rear mount setup later (as well as comparison to front canister type).

I've got all the heat shielding.

 

The first gen legacies did not have any of the additional valving or sensors on the tanks. All that it has is the two main vent ports coming off the tank that go to the fuel separator and then there is a single vent line that runs to the canister in the front.

 

Here are some pictures from my awd & 5spd swap.

 

 

 

 

Yeah, any pictures you can get would be greatly appreciated.

 

Thanks!

What year did you get the new stuff from and what year is the car you're putting it in?

 

Is that tank in the pics the one that's currently in the car?

Everything came out of a 90 Legacy and went into my 90 Legacy and is what's in the car.

I meant the new evap stuff.

 

Too dark for pics of the setup on my 96. I'll try to get some tomorrow.

Sorry, I haven't gotten any of the new stuff yet. That picture was just a picture I got from one of the guys on the Legacycentral BBS. I believe the new evap stuff in the picture was from a 02 era WRX.

HI Josh,

You'll want pics from a '00+ car, I believe. I think this was related to the Phase 2 upgrades??  All models should have this setup in the back.

 

 

Edit: Per this link on opposedforces.com it was around '97.

 

 

 

 

This is a somewhat-related POST that I dealt w/a few years back.

 

And this LINK may have some pics (from work, I can see 'em in Google, but not when I open the thread).

 

GL,

tD

Edited May 13, 201510 yr by wtdash

Todd,

 

Thanks for the info. So the earlier than 00 cars didn't have the rectangular canister?

Yeah they did. My 96 has it.

Trying to upload pics now.

Ok, thanks.

Sorry, Had a bunch of thunderstorms roll through yesterday evening and couldn't get them uploaded.

No problem. Whenever you get the chance is cool.

 

Thanks