Charcoal canister
07-18-2013, 08:55 AM
#1
2 VE's are better than one!
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Charcoal canister
Does the line underneath the canister just "vent" to air? I notice it splits and one line ties into the frame rail and one under the radiator. I don't see any special check valves or filters or anything, and I can't think of why this split would be necessary.
I need to relocate the whole unit so I'm trying to figure out Nissan's reasoning on the split as well as tying into where they do. Anybody know?
I need to relocate the whole unit so I'm trying to figure out Nissan's reasoning on the split as well as tying into where they do. Anybody know?
07-19-2013, 07:29 AM
#2
Thinking back to my canister, I want to say I know what you are talking about, but I can't recall without looking at it. One of the larger top lines should connect to the fuel tank. The line off the bottom of the canister should be vented (open to pull in fresh air). There should also be a sticker on the top of the canister that indicates/gives some idea about where each port is connected.
I don't imagine the VE and VG system setup being different (although it may be), but here is an image for the VG from the FSM. I would assume where the hoses run on the body and where they connect in relation to the intake manifold is essentially the same. See images below. I know there is a lot of coloring in the second image, just look for the "carbon canister" toward the middle bottom of the second image and trace the hoses. Hope this helps.
James, I've got the electronic FSM for a '94 Maxima, I've just not scanned any images in for that. I scanned these when putting my turbo together and figuring out what I needed to do different with my lines due to my manifold would naturally be pressurized at times.
Edit: James...I just reviewed the '94 FSM regarding the VE. Essentially, where the hoses connect is identical. However, in regard to the line that runs along the radiator, I have your answer. The lines turn up along the radiator hose and run up to the throttle body. This is where the canister connects to the intake before and at (or after) the throttle body. You should be able to trace those lines. Here is the image I was able to get. PC would not "pring screen" so had to use cell phone.
I don't imagine the VE and VG system setup being different (although it may be), but here is an image for the VG from the FSM. I would assume where the hoses run on the body and where they connect in relation to the intake manifold is essentially the same. See images below. I know there is a lot of coloring in the second image, just look for the "carbon canister" toward the middle bottom of the second image and trace the hoses. Hope this helps.
James, I've got the electronic FSM for a '94 Maxima, I've just not scanned any images in for that. I scanned these when putting my turbo together and figuring out what I needed to do different with my lines due to my manifold would naturally be pressurized at times.
Edit: James...I just reviewed the '94 FSM regarding the VE. Essentially, where the hoses connect is identical. However, in regard to the line that runs along the radiator, I have your answer. The lines turn up along the radiator hose and run up to the throttle body. This is where the canister connects to the intake before and at (or after) the throttle body. You should be able to trace those lines. Here is the image I was able to get. PC would not "pring screen" so had to use cell phone.
Last edited by Chris Gregg; 07-19-2013 at 08:05 AM.
07-19-2013, 09:14 AM
#3
2 VE's are better than one!
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Great info, thanks, but I guess I should have been more clear. I'm merely wondering about the vent line on the bottom of the canister. You answered part of my curiosity about it, though, in that it should be open to pull in fresh air.
My question/curiosity is why does that vent/line on the bottom of the canister split and get connected to the frame rail and under the radiator? What's the purpose of that split or even running them to the body if they're merely a vent to pull in fresh air? I suppose connecting them to the body "seals out" potentially "contaminated" air from the engine bay as well as keeps out gunk/debris/dirt but I still don't understand the split into two different spots.
Basically all I really need/want to know is if I can relocate the canister and just leave the bottom vent open and not need to run a hose at all?
My question/curiosity is why does that vent/line on the bottom of the canister split and get connected to the frame rail and under the radiator? What's the purpose of that split or even running them to the body if they're merely a vent to pull in fresh air? I suppose connecting them to the body "seals out" potentially "contaminated" air from the engine bay as well as keeps out gunk/debris/dirt but I still don't understand the split into two different spots.
Basically all I really need/want to know is if I can relocate the canister and just leave the bottom vent open and not need to run a hose at all?
Last edited by James92SE; 07-19-2013 at 09:16 AM.
07-19-2013, 09:46 AM
#4
IMHO, yes, just leave it open.
If there was some concern about it, maybe run a short hose if possible and aim it down in such a way/direction as to best prevent debris and crap from making it's way up in there. Maybe just run a short line and put one of those valve cover breather filters on it? LOL! I think it should be fine though. With it pulling fresh air, not sure myself why Nissan wanted lines running everywhere.
If there was some concern about it, maybe run a short hose if possible and aim it down in such a way/direction as to best prevent debris and crap from making it's way up in there. Maybe just run a short line and put one of those valve cover breather filters on it? LOL! I think it should be fine though. With it pulling fresh air, not sure myself why Nissan wanted lines running everywhere.
07-20-2013, 10:13 AM
#5
2 VE's are better than one!
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Alright well I went with this. I was expecting to have to waste half my day fabricating a bracket but I just used the stock bracket and screwed it right into an existing threaded hole in the engine bay. Glad something finally came easy on this project 
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