+ Reply to Thread
Results 1 to 13 of 13
  1. #1
    Registered Member
    Location
    BOYNTON BEACH, FL, United States
    Member No: 20176 BMW4631 is an unknown quantity at this point BMW4631's Avatar
    Join Date
    Nov 2001
    Posts
    73
    Rep Power
    0


    Yes | No

    HELP! STRONG GAS FUMES

    Help!

    I finally located where the strong gas smell is coming from.
    It's located under the driver's side back seat, next to the the left fuel sender unit. There is a gas plastic conduit that terminates without any connection at all. Gas fumes are flowing from that opening when the engine is switched ON. When i obstructed the opening with my finger the smell goes away.

    Does anyone have an idea of what the pipe is doing and if it's normal not to have anything attached to it?


  2. #2
    Registered Member
    Location
    , ,
    Member No: 58142 ROYinGA is an unknown quantity at this point ROYinGA's Avatar
    Join Date
    Nov 2002
    Posts
    2,633
    Rep Power
    0


    Yes | No

    What year and model is the car? It sounds like the

    tank vent hose is not connected to the tank. It goes to the expansion chamber which is located up over the rear axle on the drivers side behind the panels in the wheel well. The picture is for a 5/97 and later car. Earlier is not quite so complex.
    http://www.realoem.com/bmw/showparts...57&hg=16&fg=10

  3. #3
    Bmw4631
    Guest
    Location
    , ,
    Member No: Bmw4631's Avatar


    Yes | No

    Re: What year and model is the car? It sounds like

    Its a late 96, model 97 740i.
    I ll try to get back under the car sunday mornin and attempt to trace
    back that pipe, it looked like the tube is going to the back driver wheel well
    i ll let you know my findings
    by the way i had an evap emission code intermittent and the car runs
    great with no drivability issue whatsoever...

  4. #4
    Registered Member
    Location
    BOYNTON BEACH, FL, United States
    Member No: 20176 BMW4631 is an unknown quantity at this point BMW4631's Avatar
    Join Date
    Nov 2001
    Posts
    73
    Rep Power
    0


    Yes | No

    Re: What year and model is the car? It sounds like

    Hi,

    it's know confirmed that it's one of the four pipes that come from the expansion tank located in the rear left wheel well. And it's the thickest one of the four. It's probably the vent valve that allows air to enter the tanks to equlize the pressure?

    Anyhow that is the pipe that is leaking strong gas fumes constantly when the engine is on. It doesn't have the charcoal canister attached to it... I don't know what to do at this point even after spending much time on the forums...

    Can it have something to do with the expansion tank not doing its job?

  5. #5
    Registered Member
    Location
    , ,
    Member No: 58142 ROYinGA is an unknown quantity at this point ROYinGA's Avatar
    Join Date
    Nov 2002
    Posts
    2,633
    Rep Power
    0


    Yes | No

    My car is different but I think yours should have

    #7 from the tank to the plastic vapor tank and #8 back to the tank. #13 to the carbon can and #15 to the engine compartment. #15 should hook to a solenod valve near your oil filter and it should have a small hose to the intake manifold/throttle valve assembly. US cars have had the charcoal can all the way back to the mid 70s. You would probably get an emissions signal if the hoses are not hooked up but the car would still run OK. New picture.
    http://www.realoem.com/bmw/showparts...95&hg=16&fg=10

  6. #6
    Registered Member
    Location
    BOYNTON BEACH, FL, United States
    Member No: 20176 BMW4631 is an unknown quantity at this point BMW4631's Avatar
    Join Date
    Nov 2001
    Posts
    73
    Rep Power
    0


    Yes | No

    Re: My car is different but I think yours should have

    So you think i should check the connection to those hoses?

  7. #7
    Registered Member
    Location
    , ,
    Member No: 58142 ROYinGA is an unknown quantity at this point ROYinGA's Avatar
    Join Date
    Nov 2002
    Posts
    2,633
    Rep Power
    0


    Yes | No

    Yes because the gas tank will be vented to the air

    if the hoses are not connected. The solenoid valve vents the carbon can to the intake manifold at the instruction from the DME and the collected gas vapors desorb and are burned in the engine.

  8. #8
    Registered Member
    Location
    BOYNTON BEACH, FL, United States
    Member No: 20176 BMW4631 is an unknown quantity at this point BMW4631's Avatar
    Join Date
    Nov 2001
    Posts
    73
    Rep Power
    0


    Yes | No

    Re: Yes because the gas tank will be vented to the air

    Hi, I checked and it looks like all are tight and sealed.
    Can it be then the valve in the expansion tank that allows air into the pressurized system to prevent the tank to implode that could be broken or stuck open and is allowing air to flow in both directions hence the fumes of gas from the vent pipe?
    In that case do i need to replace the expansion tank?

  9. #9
    Registered Member
    Location
    BOYNTON BEACH, FL, United States
    Member No: 20176 BMW4631 is an unknown quantity at this point BMW4631's Avatar
    Join Date
    Nov 2001
    Posts
    73
    Rep Power
    0


    Yes | No

    Re: Yes because the gas tank will be vented to the air

    Little correction, it's the pipe that is coming out of the evaporative canister that is sending out the gas vapor fumes, not the expansion tank like i originally thought it was.

    I ll probably change to the new pipe version and perhaps change the canister as the valve inside of it might be defective...

  10. #10
    Registered Member
    Location
    , ,
    Member No: 58142 ROYinGA is an unknown quantity at this point ROYinGA's Avatar
    Join Date
    Nov 2002
    Posts
    2,633
    Rep Power
    0


    Yes | No

    Does your carbon can have a vent to the outside? I

    thought the only connections were from the evap tank and to the vent solenoid.

  11. #11
    BMW4631
    Guest
    Location
    , ,
    Member No: BMW4631's Avatar


    Yes | No

    Re: Does your carbon can have a vent to the outside? I

    I m not 100% sure, i ll have to open to wheel well up this weekend. Furtheremore there is still a possibility that the solenoid isn't doing it's job which is to suck up the fumes and dump them into the engine...

    i ll have to spend time on that this week, as the canister is kind of expensive.

  12. #12
    Registered Member
    Location
    , ,
    Member No: 58142 ROYinGA is an unknown quantity at this point ROYinGA's Avatar
    Join Date
    Nov 2002
    Posts
    2,633
    Rep Power
    0


    Yes | No

    You could disconnect the solenoid hoses and hit it

    with 12 volts and see if you can blow through it to test it.

  13. #13
    Registered Member
    Location
    PFLUGERVILLE, TX, United States
    Member No: 78269 claudio512 is an unknown quantity at this point claudio512's Avatar
    Join Date
    Jun 2003
    Posts
    3,130
    Rep Power
    0


    Yes | No

    Re: HELP! STRONG GAS FUMES

    Usually it occurs to a hose before fuel regulator... near firewall under the acoustics cover on the engine compartment that is leaking...



    "Keep Right, Pass Left. It's the Law."







+ Reply to Thread


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Bookmarks

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
1e2 Forum