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Fuel evap canister on 01 Nissan Sentra. #4477813
08/02/17 08:33 PM
08/02/17 08:33 PM
Joined: Sep 2009
Posts: 1,058
Illinois
Mark72 Offline OP
Mark72  Offline OP
Joined: Sep 2009
Posts: 1,058
Illinois
So I been noticing raw fuel over from back side of car where fuel cap is located. I found that the evap canister is in same location behind back quarter panel. Can a bad gas cap cause pressure build up making the canister release fuel vapor? It is the original gas cap. This I know for sure.

Last edited by Mark72; 08/02/17 08:34 PM.
Re: Fuel evap canister on 01 Nissan Sentra. [Re: Mark72] #4477932
08/03/17 03:03 AM
08/03/17 03:03 AM
Joined: Feb 2013
Posts: 3,340
Central Virginia
Silverado12 Offline
Silverado12  Offline
Joined: Feb 2013
Posts: 3,340
Central Virginia
I think the cap is supposed to keep the system sealed. It vents through the purge valve and vent valve.


12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
18 Mustang GT 5.0 auto
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto
Re: Fuel evap canister on 01 Nissan Sentra. [Re: Mark72] #4478026
08/03/17 07:36 AM
08/03/17 07:36 AM
Joined: Jul 2011
Posts: 260
SE Michigan
MichiganMadMan Offline
MichiganMadMan  Offline
Joined: Jul 2011
Posts: 260
SE Michigan
I agree with Silverado12, your gas cap is fine and there is something wrong with the purge or vent valve (or both).

Got any codes? 2001 should have fairly standard EVAP diagnostics. The conditions required for the EVAP diagnostic to run can sometimes be tricky depending on your driving cycle, so if you have a scan tool see if there are any pending codes, not just active ones.

Do you notice the raw fuel smell all the time, or only when you are or just recently fueled up?


2015 Chevrolet Impala
2008 Subaru Impreza STI
2004 Suzuki Hayabusa
1987 Honda VFR700F2
2011 Jonsered 2188 Chainsaw-The Judge.
Re: Fuel evap canister on 01 Nissan Sentra. [Re: Mark72] #4478176
08/03/17 11:40 AM
08/03/17 11:40 AM
Joined: Sep 2009
Posts: 1,058
Illinois
Mark72 Offline OP
Mark72  Offline OP
Joined: Sep 2009
Posts: 1,058
Illinois
I only ever notice the smell of raw fuel occasionally after I park the car in my garage. I smell it by where the fuel door is under the wheel well. I that the evap mechanism is right there in the same area and someone told me that if the gas cap is old…which it is from 2001, that it may not be venting properly causing the evaporator to burp out the fumes. Is that a possibility? Also, I only notice this occassionaly, and its when it is hot outside.

Last edited by Mark72; 08/03/17 11:42 AM.
Re: Fuel evap canister on 01 Nissan Sentra. [Re: Mark72] #4478204
08/03/17 12:20 PM
08/03/17 12:20 PM
Joined: Dec 2003
Posts: 9,926
Florida, Cape Coral
Eddie Online sleepy
Eddie  Online Sleepy
Joined: Dec 2003
Posts: 9,926
Florida, Cape Coral
The vapor canister is part of a closed system and should not vent to the atmosphere. The gas vapors in the canister are supposed to vent into the engines intake system when driving. The problem you describe is frequently caused by people over filling the fuel tank by continual trying to top-off the gasoline tank rather than shutting off at the first or second click. I suspect your canister needs to be replaced and the vent valve checked. Ed


CX5 Touring 2.5L :-)
Re: Fuel evap canister on 01 Nissan Sentra. [Re: Mark72] #4478250
08/03/17 12:55 PM
08/03/17 12:55 PM
Joined: Sep 2009
Posts: 1,058
Illinois
Mark72 Offline OP
Mark72  Offline OP
Joined: Sep 2009
Posts: 1,058
Illinois
I'm not doubting what you say is true. you guys know a lot more about cars than I do. but strangely, this evap canister that is shaped like a big plastic box has a round drain tube or vent of some nature coming out of it and angling down toward the ground. So it has to be there to release something right?

Re: Fuel evap canister on 01 Nissan Sentra. [Re: Mark72] #4478268
08/03/17 01:10 PM
08/03/17 01:10 PM
Joined: Sep 2009
Posts: 1,058
Illinois
Mark72 Offline OP
Mark72  Offline OP
Joined: Sep 2009
Posts: 1,058
Illinois
I found a diagram of it. click on this link. to the left of the diagram you see a tube angling downward. The view is as if you were laying on the ground looking up at it.

https://goo.gl/images/3L2FHz


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