Raw fuel smell from rear of vehicle 2007 Lincoln town car

Discussion in 'Domestics' started by corcovado, Jun 19, 2017.

  1. corcovado

    corcovado Jr. Member

    Joined:
    Feb 25, 2009
    Messages:
    48
    Likes Received:
    0
    Please fill out the following to ask a question.

    MAKE: Lincoln
    MODEL: Town Car
    YEAR: 2007
    MILES: 80,000
    ENGINE: 4.6
    DESCRIBE ISSUE...

    .Hi all,
    My 07 signature limited with 80,000 miles has a raw gas smell coming from the rear. No visible leaks, no over consumption of fuel. Coming from the rear wheel well areas.

    However not all the time....and with various tank amounts (1/2, 3/4, etc)

    So much so that on a hot day, with high humidity you can smell it inside the passenger cabin.

    No check engine light on.

    Definitely not under the hood, as I checked and double checked that.

    Looked at filler neck, and where it goes into the tank, no evidence of leaking, no evidence of rust.

    Any thoughts appreciated
    Thanks
     
    Last edited: Jun 19, 2017
  2. billr

    billr wrench Staff Member

    Joined:
    Mar 12, 2007
    Messages:
    5,756
    Likes Received:
    55
    Have it checked for codes, even it the CEL isn't on (it does work?).
     
  3. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,623
    Likes Received:
    109
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    Probably a saturated evap canister, or a continuously venting canister. Highly recommend as Billr, said to read codes from the ECM/PCM.

    You may want to get the evap system smoke tested. I may help narrow down diagnostic time to locate the fuel vapor leak that is causing this smell.

    Normally, if no noticeable leaks are not found, you are just smelling fuel vapors and it is normal to get stronger smells on hot days as the pressure inside the tank will increase with outdoor temps. Simple principle of physics really. Most gasses expand with heat. Bingo.

    Often times, a smoke test will reveal a stuck open canister vent valve. Yours is located here. See #1 of following diagram.

    Screenshot (74).png
     
  4. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,623
    Likes Received:
    109
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    Of note you will notice the breather tube is located exactly at rear wheel well passenger side. ;)

    I have seen numerous times a scanner able to actuate the vent solenoid but it is stuck in its bore and continuously vents the canister, hence not redirecting the vapors back to the engine for the core principle of what a evap system is for. Which is to burn the fuel vapors and not let them be released into the environment.
     
  5. corcovado

    corcovado Jr. Member

    Joined:
    Feb 25, 2009
    Messages:
    48
    Likes Received:
    0
    Yes, CEL does work.
    I will check for codes nonetheless.
     
  6. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,623
    Likes Received:
    109
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    If your willing, try this out.

    Incense smells better than gas.
     
  7. corcovado

    corcovado Jr. Member

    Joined:
    Feb 25, 2009
    Messages:
    48
    Likes Received:
    0
    Ok, thanks I will check out the Evap system to see for any abnormalities.
     
  8. jd

    jd Hero Member

    Joined:
    Jan 14, 2007
    Messages:
    368
    Likes Received:
    16
    Different Ford product, but I had gas smell that traced to a broken down hose on the evap canister. Mine was a small "wiper hose" looking thing but with a 90* bend. I couldn't find one so I used a longer hose formed into a loop to get the ends connected.
     

Share This Page