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Unread 10-15-2013, 01:17 PM   #1
wsmm
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2000 XJ Cherokee 
 
Join Date: Feb 2007
Location: michigan
Posts: 164
Instructions for DIY smoke testing a 2002 EVAP system

Removed a section of bad evap hose going from the charcoal canister to the fuel tank and replaced the bad section with fresh fuel line and a barbed brass fitting to tie the two pieces of hose together. Thought I had the problem fixed, but got back my P0455, although the P0442 code seems to be gone. I'd like to smoke test it now to see if I can find why I'm still getting the P0455 code. I built my own smoke unit from an idea I found on the Internet. I'm using mineral oil to create the smoke and an aquarium air pump (small one) to generate a low pressure smoke flow. I've read that you should use nitrogen, but have also found commercial units that use shop air for EVAP testing. Can't see where shop air would cause a problem as the EVAP system itself uses a vacuum operated air pump to pressurize the system for initial testing. Can anyone provide a write up for doing the smoke at home using basic equipment, with no fancy factory scan tool being used? If it had pictures so much the better. Any and all suggestions and comments are welcomed and appreciated.
Thanks,
Bill

To those who are saying to get fuel line from the parts store, do you have a list of diameters needed? How much of each size did you buy? I've lowered the cage holding the evap unit per the manual, what does removing the bumper buy you?

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Unread 10-15-2013, 03:43 PM   #2
nickblack
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1999 WJ 
 
Join Date: Dec 2010
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Posts: 739
I have used a cigar to smoke test for a leak. It worked. Just blow the smoke thru an open vacuum line. No need for fancy equip.
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Unread 10-15-2013, 04:10 PM   #3
SirSilvia
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2002 WJ 
 
Join Date: Sep 2013
Location: Pittsburgh, PA
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I have the same code and would like to see some options, my compressor has a regulator and feel that kind of pressure would eff something else up before fixing the problem
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Unread 10-15-2013, 04:29 PM   #4
tufmar
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1998 ZJ 
 
Join Date: Feb 2002
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I recently went through the same thing with my '02 and it got really frustrating trying to track down the culprit cracked hoses. Have you checked the hoses under the hood, those are some of the more common ones to crack and are the easiest to fix. Google image some pix for those if your not familiar..

I fixed those but my lights came back on so I had to remove the bumper cover and drop the canister itself. I found a few more cracked hoses and buttoned it back up...learned the hard way I didn't find all the cracked hoses and had to rip the bumper back off. Each time I would look even harder and find very tiny cracks in other hoses.

So finally I found the hoses that connect from the hard fuel lines to the evap canister that are in front of the gas tank were the culprit.

Moral of huge story, just drop the bumper and replace most if not all of those hoses. Mopar sells a replacement kit but it was overpriced for some rubber hose. I just went to the auto parts store and got a couple feet of fuel hose in the corresponding sizes
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Unread 10-16-2013, 12:15 AM   #5
SirSilvia
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Wj

Quote:
Originally Posted by tufmar View Post
Moral of huge story, just drop the bumper and replace most if not all of those hoses. Mopar sells a replacement kit but it was overpriced for some rubber hose. I just went to the auto parts store and got a couple feet of fuel hose in the corresponding sizes
This is what I'm about to do, so it can last another 10+ years. Just to be done with it. You really have to be snorkeling mud to F up the solenoids and such.
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