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I have two Bing 54 carbs on my Rotax 582 mod 99.

Each one has a 1/4" OD fuel line that runs from one side of the carb to the other side. Both lines have a hole at the lowest point, which is about midway. The holes look like they were intentionally punched - not manufactured that way.

Can anyone tell me what this line does, and why there's a hole at the lowest point?

Thanks (once again),
Mike
  • Re: Bing 54 fuel lines

    by » 8 years ago


    All they are are vent tubes for the carb float chambers...some years ago they used to fit 2 separate pipes to each carb body...but Rotax found a problem with that set-up and modified the idea to the U shaped tube.

    Nick.

  • Re: Bing 54 fuel lines

    by » 8 years ago


    The holes are just to allow any overflow to escape from the tube. I make my own by just drilling a couple of holes in the center of a length of fuel line. If I remember correctly, it's the same size fuel line used for the primer.

    Bill.

  • Re: Bing 54 fuel lines

    by » 8 years ago


    Does that mean it would be normal to see fuel dripping from the hole?

  • Re: Bing 54 fuel lines

    by » 8 years ago


    Mike,

    It's not normal to see fuel coming from the vent but it's not necessarily a problem either. Sometimes even a steep uncoordinated bank will cause an overflow. sometimes taxiing over rough ground can do it. If all your temps are good and the engine is running OK, I wouldn't worry about an occasional overflow.

    If it becomes a common event though, it could be trash in the float valve, a leaky and sinking float, a fuel pump overpressuring the carb, or float arms out of adjustment. All easily fixable.

    Bill.

  • Re: Bing 54 fuel lines

    by » 8 years ago


    Bill, thanks for the info. I e only had my plane for a total of 5 engine hours so I'm on a steep learning curve. And I have never been into mechanics before so that is t helping. But I am planning to know everything I can about this engine!

    All easily fixable? For you, maybe. For me? Ha! Lets sell some tickets and make a few bucks

    I had no engine problems during those 5 hours last Fall and I hope that continues so I will have time to learn more before something does go wrong.

    I also need to learn more about the carbs. I wish I had an old one to tear apart and look inside!

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