EVAP leak

Tiny
DOORGUY321
  • MEMBER
  • 2002 DODGE DAKOTA
  • 3.9L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
My vehicle keeps throwing up codes for an evap leak (large and small). I have replaced the gas cap, gas filler pipe, Evap solenoid, evap pump, all hoses under the hood and all the way back to the evap canister. When I smoke test it the only place I see smoke is from the evap filter. Is this normal? Any ideas?
Monday, September 21st, 2020 AT 5:23 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

Can you provide the specific codes you have? Also, I attached a picture below. Is this the filter you are referring to? It shouldn't leak if that is what you are referring to.

Let me know.
Joe
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Monday, September 21st, 2020 AT 5:43 PM
Tiny
DOORGUY321
  • MEMBER
  • 3 POSTS
Thank you for your reply. The codes are PO455 and PO456. The smoke comes from the Evap filter. Mounted on the inner fender behind the battery.
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Tuesday, September 22nd, 2020 AT 5:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

I have to ask if you could take a pic and upload it for me to see. As far as a filter behind the battery, I'm not sure I've ever seen one. I've owned Dakota's since 1990 up through the last year they made them and never recall such a thing. As far as a leak, the system is sealed and shouldn't leak. The only time I have seen a leak is if it comes through the intake and out the throttle body.

Is the component located near the EVAP test port? Does it look like the attached pic? If so, let me know. The pic is of a canister purge solenoid.

Let me know.

Joe
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Tuesday, September 22nd, 2020 AT 6:30 PM
Tiny
DOORGUY321
  • MEMBER
  • 3 POSTS
It’s called a vapor leak detection pump filter. It’s located on the inner fender behind the battery below are the purge solenoid. The hose that connects from the purge pump actually passes under the battery case.
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Wednesday, September 23rd, 2020 AT 4:46 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

Okay, that makes sense. As far as leaking, no it shouldn't. It us used to pressurize the EVAP system to identify if there is a leak and how quickly air escapes. It will draw air in via the filter.

Joe
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Wednesday, September 23rd, 2020 AT 6:45 PM

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