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Float chamber

in General Tech Discussion 10 years ago
Hi, the vent pips off the float bowl bend backwards and cable tie round the air filter, I have seen pictures of the pipes going to down to the float bowl and tucked under the float chamber clip. I emagine that pressure could have an effect on the fuel level in the chamber, what is the correct position.

  • Re: Float chamber

    by » 10 years ago

    Hi Andy,

    My vent pipes are short and are tucked under the float bowl clips. They have always been like that and experience tells me that you need to be careful with these pipes otherwise you can have an adverse effect on the mixture.

    Kevin
      
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  • Re: Float chamber

    by » 10 years ago

    Many owners have their carb vent tubes tucked into the bowl wire bale. Some have them tee'd together and run down the back of the firewall. If you have a Rotax airbox they run back to that. They can be in different places you just don't want them in a high vacuum area (like in the aircraft air stream) or a high positive pressure area and you want them to get equal air pressure.

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

      
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  • Re: Float chamber

    by » 10 years ago

    Thanks Roger, to me the position they are in alongside the air filters(K&M type)will be a spot where there is high vacuum, am I correct in thinking this would have the effect of raising the fuel level in the chamber?

    :unsure:
      
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  • Re: Float chamber

    by » 10 years ago

    Hi Andrew,

    If you tuck the vent tube just under the bowl wire bale you'll be good to go. This spot should not cause you any issues. That should be a high vacuum area.

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

      
    Report

  • Re: Float chamber

    by » 10 years ago

    Quite a few of us have run the vent tubes into the back of the K&M air filters thru a tight fitting hole drilled in the rubber down low. This is essentially the same as running them into the airbox if you have one. By keeping the hole as low as possible the tube maintains a gradual slope down so any fuel will not puddle up in the tube. The advantage of this arrangement is that any fuel overflow or drip will not fall on hot exhaust parts, but will be sucked back into the carb. I was very leery about doing this at first because it is not "Rotax Approved", but tested it both ways and found no differences in engine running, smoothness, fuel pressure, etc.
      
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