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  1. #1
    Ryan Turner
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    tank venting system, major leak error code: HELP!

    I have a 97 BMW Z3 2.8 with 260,000 miles (yeah, I know). There is a problem that may finally total this car, as I dont know if I am going to spend the money it may require to have it fixed.

    There is a check engine light on indicating a "tank venting system, major leak." My very good mechanic has done a lot of things to look for the leak so far. He has replaced the purge valve and we have purchased a new fuel cap as well as new seals for the old one. We cannot get the error code to clear. It looks like the next step is going to be to drop the entire tank, and that is a major deal.

    Has anyone else run into this problem?

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    Re: tank venting system, major leak error code: HELP!

    I'm not sure how that is diagnosed in the older car like yours (newer car actually have a separate pump which pressurizes the tank an measure the decline in pressure): I'll try to look around in my literature...

    I know the DIS (the official BMW diagnostic platform) has a very through diagnostic procedure when it comes to fuel thank leaks that help you narrow down to the source of it; I suspect your mechanic is an Indy who just uses a general code reader...

    In some pictures I once saw somewhere some of the epoxy used to seal some of the sheet metals around the fuel thank was exposed and rubbed against the fuel thank. In that specific instance you could only notice a minor dent in the thank... But as time would have gone by it would have probably ended up causing a rupture in the fuel thank...

    The only suggestion I have right now is to fill up the fuel thank ALL the way while on a lift and see if you find a leak...
    ---------------------------------



    2003 Z4 2.5i
    2002 Ducati Monster S4


  3. #3
    Ryan Turner
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    Re: tank venting system, major leak error code: HELP!

    Thank you for the reply. The shop is an indy, but they only handle BMWs and have an expensive code reader. My mechanic is awesome, but as he states, they only get a small representation of all the problems out there since they are a small shop compared to the dealer.

    One thing I have noticed, is that regardless of fill level, after you get done driving and look at the seal around the gas cap, it is always wet with gas. I figure gas sloshed up there, and that is to be expected, but if any of you wouldnt mind confirming yours is wet or not, I would appreciate it.

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    That's your problem...

    Fuel is not supposed to escape...

    Try this.

    If you have an old tire tube laying around cut out a disk so that it fits tight on the fuel cap. The gasket might have dried and shrunk over time.
    ---------------------------------



    2003 Z4 2.5i
    2002 Ducati Monster S4


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    Ryan Turner
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    Re: That's your problem...

    Well, thats the problem. We have done the following:

    1) Purchased a new gas cap (after market).
    2) Doubled up after market seal (can barely turn it because it is so snug)
    3) Took OEM seal and fit it on existing OEM cap.

    In all three of those instances, you can still see gas on the seal.

    What would be an 'idea' jimmy rig to rule this out once and for all?

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    Ryan Turner
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    Re: That's your problem...

    Oh, and in all three instances, we reset the check engine light and waiting to see if it would clear inspection mode.

    I dont care if I need to duct tape the damned thing shut to see if the check engine light will clear. At this point I want to pinpoint the problem.

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    Sorry... I didn't read that in your...

    ...previous post. So you did replaced the seal already.

    Here's the diagram of your fuel thank: http://www.realoem.com/bmw/showparts...05&hg=16&fg=05

    As you can see there's a lot of stuff around it, but none of them is accessible without dropping the fuel thank.

    It could be an actual leak or it could be the sensor being faulty.

    I can't help you much more: of all the problems that Z3 normally have, the fuel thank is not in my top 10, so I can't help much... Maybe someone else has some first hand experience with this, otherwise it's just guesswork...
    ---------------------------------



    2003 Z4 2.5i
    2002 Ducati Monster S4


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