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Used smoke machine and smoke coming out below filler cap

Tiny
JIMHERRMANN
  • MEMBER
  • 2004 JEEP LIBERTY
  • V6
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
Get an engine code of a small Evap leak. Used smoke machine and smoke coming out below filler cap. Leak not coming from cap.
Saturday, April 16th, 2022 AT 10:26 AM

19 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

When you say filler cap, are you referring to the fuel tank filler tube? If so, inspect for small rust holes or any evidence of corrosion that could have eaten through the steel.

Also, there will be a rubber hose between the filler tube and tank, check that for leaks as well.

Keep in mind, there are several Evap components around the fuel tank. If possible, check from the underside of the vehicle to tell approximately where it is coming from.

I attached a pic below showing the leak detection pump toward the front of the tank and many hoses related. Any of these can be leaking.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below Pic 2 shows what the filler tube looks like, so check anywhere it could rust and everything from the tank to the filler opening.
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Saturday, April 16th, 2022 AT 8:30 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
Smoke coming out by the filler cap in the fender well. I think there is a purge valve there, not sure if that is what it's called. I think that is where the smoke comes out. I also have smoke coming out of the throttle body.
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Sunday, April 17th, 2022 AT 7:02 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I know there is a vent there that is filtered. By chance, do you see the component in the pics I attached above?

Let me know, and I hope you had a nice Easter.

Joe
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Sunday, April 17th, 2022 AT 7:14 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
It is the picture with the cap and hose to rank. It is attached just below the cap.
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Sunday, April 17th, 2022 AT 8:03 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
It is the picture of the filler neck with cap. Black object attached to the hose/pipe that allows you to put gas in the tank.
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Sunday, April 17th, 2022 AT 8:27 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Okay, that is steel. It may have rusted and developed a few pinholes. Are you able to remove it and inspect for damage?

Let me know.

Joe
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Sunday, April 17th, 2022 AT 8:59 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
No rust or holes. Smoke coming from somewhere in fender well. What is the black canister looking thing that is about two inches in diameter? I think the smoke is coming from it.
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Sunday, April 17th, 2022 AT 9:10 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

Does this appear to be the part you are referring to? If so, that is the vent filter. The OEM part number is listed in the pic.

Let me know.

Joe

See pic below.
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Sunday, April 17th, 2022 AT 10:55 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
To order it, it shows the complete fuel filler neck with this part as part of the assembly.
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Monday, April 18th, 2022 AT 6:10 AM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
Do you think smoke should be coming out of it?
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Monday, April 18th, 2022 AT 6:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I did notice that as well. No, there shouldn't be smoke coming from it. It's a bit frustrating that you need to replace other things that are good, but I tried as well to find just the needed part, and it doesn't seem available by itself.

Let me know if it takes care of the issue.

Take care,

Joe
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Monday, April 18th, 2022 AT 2:05 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
Thanks Joe. Will try the parts. Will let you know.
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Monday, April 18th, 2022 AT 2:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

You are very welcome. I hope this takes care of the issue for you. It should. Let me know because I'm interested in knowing.

Take care,

Joe
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Monday, April 18th, 2022 AT 8:47 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
Will do. I did find the part separately. Have to order.
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Monday, April 18th, 2022 AT 8:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Excellent. I'm glad to hear that. Also, it will likely help others to know that information in the future.

I will watch for your reply.

Take good care of yourself.

Joe
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Monday, April 18th, 2022 AT 8:52 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
You too and it might be a couple weeks before I get the part and install it. I was going to tell you I built my own smoke machine for under $20.00.
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Monday, April 18th, 2022 AT 9:02 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

You need to send me the directions for the smoke machine. LOL

Let me know what you find.

Joe
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Tuesday, April 19th, 2022 AT 4:22 PM
Tiny
JIMHERRMANN
  • MEMBER
  • 16 POSTS
Another question on a 2014 dodge grand caravan using a doorman dipstick what should the fluid readings be? I know the procedure. My reading is 40 mm.
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Friday, July 22nd, 2022 AT 2:06 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Thursday, October 20th, 2022 AT 11:46 AM

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