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Hesitate to ask the question since it probably does not relate directly to Rotax. Aircraft is a Gobosh AT-4, have noticed fuel smell in the cockpit, trying to determine what the cause may be. Checked the vents for the fuel tank and drains for air intake flow(total of four vents and drains) The fuel tank is mounted forward of the panel behind the firewall. Checked carburetors thinking that there might be a problems with gaskets, fuel lines, and can not find the problem. Overflowed the tank when adding fuel but did not seem extensive. Aired-out the cockpit but can still smell the fuel. Wondering if this is a problem anyone experience something similar to this?
  • Re: Fuel Smell

    by » 11 years ago


    My experience is that even very small fuel spills smell very strongly and the smell lingers for a long time. MOGAS is particularly bad. I also find that fuel tank vents that vent underneath the aircraft can cause fumes to enter the cockpit leaving a strong smell.

  • Re: Fuel Smell

    by » 11 years ago


    Thanks Kevin, first time I mixed 87 Octane with 100LL (91 Octane needed) and the spill occured adding mogas, believe you are right, have had spills before but this is the first time with the smell. Roland

  • Re: Fuel Smell

    by » 11 years ago


    Hi Roland,

    It only takes 2-3 drops of fuel for you to smell it in an enclosed cockpit. I have seen this a few times on a Flight Design CT at a fuel fitting on the wing tank bulkhead. No visible fuel and really not wet, but the smell was strong. Only tattle tail sign was a slight yellowing just under the fitting.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: Fuel Smell

    by » 11 years ago


    Ongoing saga of the fuel smell. Still worried about the smell lingering, now told by a person that has some background on the Gobosh 700, that it may be a leak from fuel tank to the sump drain. If so it would require removing the center console and side panel to see if this may be the problem, would be difficult to get at it and labor intensive to do this. Hoping that it is just a normal smell from the fuel. Any experience with this problem on the Gobosh, and is there a way to get to this area short of doing the above procedure?

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