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Bing carb breather/over flow

in General Tech Discussion 14 years ago
I don't know if it's a problem but it certainly could be, the short hoses are positioned so that if they over flow the gas will be dumped on (1) a spark plug or (2) the exhaust,,,,not good. I added some long hose so that if such a thing happens the gas will be dumped out bu the parachute, the hoses must face opposite to the flow of air otherwise the the bowls could become pressurized and the engine will quit.

It's a cheap fix to a potential major problem.

  • Re: Bing carb breather/over flow

    by » 14 years ago

    I Have one carb tray that collects about one teaspoon of fuel every 4 hours. It then runs down a tube and exits on the belly of my beautiful Remos GX. Why is the one carb leaking fuel?
      
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  • Re: Bing carb breather/over flow

    by » 14 years ago

    The reasons carbs vent or leak fuel are:

    vent tube in the wrong place, carb gasket bad, carb float level needs adjustment, bad floats, float needle gone bad, poor carb sync which cause too much engine vibration and the floats / float needle can't control the fuel level.
    Usually it it is a bad gasket or poor carb sync, but the other reasons should also be ruled out.

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

      
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  • Re: Bing carb breather/over flow

    by » 14 years ago

    I don't know if it's a problem but it certainly could be, the short hoses are positioned so that if they over flow the gas will be dumped on (1) a spark plug or (2) the exhaust,,,,not good. I added some long hose so that if such a thing happens the gas will be dumped out bu the parachute, the hoses must face opposite to the flow of air otherwise the the bowls could become pressurized and the engine will quit.

    It's a cheap fix to a potential major problem.


    There's a right way and a wrong way to do this. The right way is to position the end of the breather tube inside a larger diameter tube without directly connecting the breather tube to the extended drain tube.

    The wrong way is to directly connect the breather tube to a longer tube of the same diameter with an inline connector. The reason for this is that the so-called breather tube is really an ambient pressure tube which ensures that the air above the fuel in the carb bowl is at ambient pressure. If you extend the breather tube the wrong way, the air pressure in the carb bowl will be affected and the operation of the carb will be compromised with unpredictable results.
      
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  • Re: Bing carb breather/over flow

    by » 14 years ago

    Mike, please re-read what I wrote about hose positioning.
      
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  • Re: Bing carb breather/over flow

    by » 14 years ago

    Mike, please re-read what I wrote about hose positioning.


    I read it. I have no idea whether you did it correctly as your original post does not contain enough information. The fact that you're concerned with how the ends of the extended hoses are positioned suggests to me that you did it the wrong way, by connecting a longer tube with an inline connector.

    The carb vent tubes are designed to sense ambient air pressure at the level of the air intakes to the carbs. Any extended drain tube must not affect this pressure sensing function.
      
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