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Thread: Smelling petroleum in the car

  1. #1
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    Smelling petroleum in the car

    Hi

    Just went to the gas station an full up the fuel tank to a 3/4.
    When we drove a bit, I was smelling petrol in the car.
    I didn’t find any leaks in or under the car.
    What could the problem be?

    Niklas

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  3. #2
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    Re: Smelling petroleum in the car

    Although rare... it can be a cracked fuel tank. But first check the fuel level sender O-rings and the fuel cap gasket, and of course the hoses below the car.

    If you cannot find ANY leaks, and continue to smell gasoline inside the car, it's pretty likely to be the tank itself. I had to replace it on one of my cars, and another of my cars had the tank replaced by the previous owner for the same issue.

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  5. #3
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    Re: Smelling petroleum in the car

    Dave, this sounds serious!
    I
    Was there any bulletins from MB on the 90 liter tanks of the .036’s?
    What can we say about the safety aspect regarding this issue?


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    Re: Smelling petroleum in the car

    Sometimes if you overfill (“top off”) the gas tank you can get fumes in the trunk/interior of the vehicle.

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  9. #5
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    Re: Smelling petroleum in the car

    Quote Originally Posted by Eno View Post
    Dave, this sounds serious!

    Was there any bulletins from MB on the 90 liter tanks of the .036’s?
    What can we say about the safety aspect regarding this issue?
    It's really rare. I have never heard of any TSB about the issue. I"m curious if Klink has any commentary to add, I assume he's seen this at least once or twice in his career.

    From what I can tell, it's caused by a problem with the venting system, and the tank starts to partially collapse from vacuum (normally, the tank is pressurized). Sometimes, as in my case, the collapse was so slight it was almost invisible even with the tank removed from the car and placed next to a good tank. The clue I had was the tank would only hold about 21 gallons instead of 23+, and after eliminating all other possible sources for the strong gasoline smell inside, I pulled the tank. The cracks were so small they were not visible, but the tank was damp in some areas that should have been dry. Never had a problem after swapping the tank out - with the replacement tank in, the odor was completely eliminated, and the tank went back to taking a full 90L / 23.x gallons.

    I did see this happen once on an 80L tank in a W210, btw... but the tank didn't crack or leak, it just collapsed drastically. Venting issue was the root cause there as well.


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  11. #6
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    Re: Smelling petroleum in the car

    Quote Originally Posted by gsxr View Post
    It's really rare. I have never heard of any TSB about the issue. I"m curious if Klink has any commentary to add, I assume he's seen this at least once or twice in his career.

    From what I can tell, it's caused by a problem with the venting system, and the tank starts to partially collapse from vacuum (normally, the tank is pressurized). Sometimes, as in my case, the collapse was so slight it was almost invisible even with the tank removed from the car and placed next to a good tank. The clue I had was the tank would only hold about 21 gallons instead of 23+, and after eliminating all other possible sources for the strong gasoline smell inside, I pulled the tank. The cracks were so small they were not visible, but the tank was damp in some areas that should have been dry. Never had a problem after swapping the tank out - with the replacement tank in, the odor was completely eliminated, and the tank went back to taking a full 90L / 23.x gallons.

    I did see this happen once on an 80L tank in a W210, btw... but the tank didn't crack or leak, it just collapsed drastically. Venting issue was the root cause there as well.

    Hi everyone
    We found what’s wrong
    It was just the gasket on the cap to the fuel tank.
    The rubber was cracked and the fuel leak out on the rear panel..

    Best Regards
    Niklas

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