Evap canister question
11-04-2013, 04:44 PM
#1
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Year: 2001 XJ
Model: Cherokee
Engine: 4.0
Evap canister question
Hello,
I'm getting the code for evap small leak on my 2001 xj. The rubber lines look good out of the purge solenoid to the evap canister but the metal line coming out of the canister is really badly rusted. Would that be a possible cause and if so how easy it to replace. I'm not familiar with its function.
Thanks
I'm getting the code for evap small leak on my 2001 xj. The rubber lines look good out of the purge solenoid to the evap canister but the metal line coming out of the canister is really badly rusted. Would that be a possible cause and if so how easy it to replace. I'm not familiar with its function.
Thanks
11-04-2013, 06:48 PM
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Year: 2001 XJ
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Engine: 4.0
What is the code?
The rectangular evap canister, located underneath the vehicle, should have three plastic ports connected to rubber hoses. Should be the same for 97 or 98 through 01 (federal emissions).
From what I remember from a few years back after dropping the tank, there is a metal line coming from the fuel tank with a rubber hose to the canister. I can't remember if there is a rubber connection on both ends of the metal tubing. If it is leaking you should be able to splice in a new piece of metal tubing.
The three ports should be .. one for the intake, vacuum line from the purge solenoid and the third is for fuel vapors and roll-over from the fuel tank.
If one of the lines is not leaking. Evap canisters potentially can crack. Sometimes the plastic ports break off or develop a leak.
The rectangular evap canister, located underneath the vehicle, should have three plastic ports connected to rubber hoses. Should be the same for 97 or 98 through 01 (federal emissions).
From what I remember from a few years back after dropping the tank, there is a metal line coming from the fuel tank with a rubber hose to the canister. I can't remember if there is a rubber connection on both ends of the metal tubing. If it is leaking you should be able to splice in a new piece of metal tubing.
The three ports should be .. one for the intake, vacuum line from the purge solenoid and the third is for fuel vapors and roll-over from the fuel tank.
If one of the lines is not leaking. Evap canisters potentially can crack. Sometimes the plastic ports break off or develop a leak.
11-04-2013, 06:56 PM
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Year: 2001 XJ
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11-05-2013, 06:39 AM
#11
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Year: 1999
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Edit: Correction to above. It's a 1/4" x 1/4" barb coupler not a 1/4" x 5/16" coupler.
Last edited by CCKen; 11-05-2013 at 07:20 AM.
11-06-2013, 09:00 AM
#12
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Year: 2001 XJ
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I replaced that steel tube that goes from the fuel tank roll-over valve to the canister with a length of 1/4" ID fuel hose. The problem is that at the rubber elbow that connects to the canister which is 5/16" ID at the canister and 1/4" ID to the steel tube. I used a 1/4" x 1/4" coupling to join the the two. My steel tube had a pinhole in it that triggered a evap CEL. When I removed the rusty old steel tube I bent it and it snapped like a twig.
Edit: Correction to above. It's a 1/4" x 1/4" barb coupler not a 1/4" x 5/16" coupler.
Edit: Correction to above. It's a 1/4" x 1/4" barb coupler not a 1/4" x 5/16" coupler.
11-06-2013, 09:02 AM
#13
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Year: 2001 XJ
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Also would it be best to pull the whole line out from the purge to the canister to check thoroughly or replace the rubber section with line set along the firewall.
11-06-2013, 01:06 PM
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Year: 1999
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Just be careful removing the rubber coupling that connects the steel tube to the plastic tube coming from the roll-over valve. I used a box cutter to slit the rubber coupling lengthwise because it was on the plastic tube so tight I struggled getting it off.
Last thing you want to do is dick up that plastic tube.
11-06-2013, 01:11 PM
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Year: 1999
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There's no reason to remove the plastic evap tubing from the engine bay, or along the frame rail, to the evap canister to check it out. Just carefully give it a close visual examination. Check for chafing of the tubing around the area of the brake booster. There's a cluster of tubing, etc. at this intersection that may have caused chafing. I found the evap tube in this area partially chafed on a brake line so if repositioned it.