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Thread: Gas leak problem, stumped

  1. #1
    Join Date
    Feb 2011
    Location
    Wisconsin
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    1,750
    My Cars
    1995 BMW M3

    Gas leak problem, stumped

    Hello guys, so here is what I am dealing with. I have a 2002 325i. I noticed a gas leak a while back, coming from the center of the car. I shut the car down to investigate. Didn't see much, started it back up and it did nothing, no leaking. Drove it like that for a few weeks, then it started again. I opened the hood and saw it coming from the top of one of the injectors. I took all the injectors out, put new o rings on all of them, resembled the car, and it seemed good.

    Drove it for a couple of days, filled it up with gas, put about 10 miles on it, then it started pouring out again. Moved it into the garage to investigate, now it is not doing it. I am so confused. Now I keep going out in the garage to start it and cannot get it to leak again. It literally pours out of the car.

    Any ideas?

  2. #2
    Join Date
    Jan 2017
    Location
    USA
    Posts
    284
    My Cars
    E21, E46
    Go to home depot and buy one of these:

    https://www.homedepot.com/p/BrassCra...1-X6/202800802


    For $20 it works extremely well locating leaks.

    Open your gas cap and try it there so you have confidence in the tool.

  3. #3
    Join Date
    Jul 2011
    Location
    Arlington, VA
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    9,923
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    2018 BMW M240i
    The only way to find the gas leak is to get the car up in the air while the engine running g. I’m betting one if the three rubber hoses at the fuel filter is leaking. Each hose is about 2” in length. They connect the steel gas lines to the fuel filter. The filter is located under the car, under the driver’s seat, behind a steel panel inboard of the frame rail. Replace the filter with one made by either Mahle or Keyser. Don’t install an aftermarket fuel filter as the filter contains the fuel pressure regulator.

  4. #4
    Join Date
    Jan 2016
    Location
    Ca
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    6,981
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    2001 525it
    Also I would remove the rear seat cushion the acess panels for the left and right fuel senders and see if there is recented staining. Does it leak only after filling the tank, if so the leaks mostly from the mentioned areas above

  5. #5
    Join Date
    Feb 2011
    Location
    Wisconsin
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    1995 BMW M3
    I will check all the mentioned and reply with a status. Thanks a ton guys! Much appreciated.

  6. #6
    Join Date
    Jan 2017
    Location
    USA
    Posts
    284
    My Cars
    E21, E46
    Marco you don't like Mann fuel filters?

  7. #7
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,923
    My Cars
    2018 BMW M240i
    I’ve never installed a Mann fuel filter. I’ve always bought Mahle fuel filters. I do buy Mann oil filters and I’ve never had a problem with them. So I think it’s safe to assume that a Mann fuel filter should be ok.

  8. #8
    Join Date
    Jan 2017
    Location
    USA
    Posts
    284
    My Cars
    E21, E46
    Ok, I asked in case you had a reason you didn't mention Mann. My E46 has had a Mann fuel filter for 2 years and it has been fine.

    I didn't realize mahle also made fuel filters for our cars. I will try one of those next fuel filter change.

    Thanks

  9. #9
    Join Date
    Jul 2011
    Location
    Arlington, VA
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    My Cars
    2018 BMW M240i
    Not a problem!

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