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912s Fuel Pump

in 912 / 914 Technical Questions 13 years ago
I just received a new 912s engine and have been installing the fuel lines. I noticed a small tube nipple hanging straight down under the neck of the fuel pump. It is an open nipple with no apparent purpose. I can't find any info on it or any reference to it in the Rotax parts or heavy maintenance manuals. What is it and what do I do with it? Do I plug it with something or hook it up to something?

Jim

  • Re: 912s Fuel Pump

    by » 13 years ago

    Hi james,

    Do not block it off. It is a vent tube. Install a tube on the fitting and run it down to an opening on the bottom of the cowl. Keep it away from the hot exhaust pipes. Do not run it out into the air slip stream.

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

      
    Report

  • Re: 912s Fuel Pump

    by » 13 years ago

    Thanks Roger.
    I am amazed there is not a thing in the engine documentation about it. Is it something brand new they have added and not yet documented it?

    Jim
      
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  • Re: 912s Fuel Pump

    by » 13 years ago

    Hi James,
    New items and changes are documented in SI-912-020 "running mods" (attached).
    This SI is broken down into ATA-100 chapter system just like other aviation manuals:
    00-00-00 Introduction
    73-00-00 Fuel system
    74-00-00 Ignition
    75-00-00 Cooling
    76-00-00 Engine controls
    78-00-00 Exhaust
    79-00-00 Lubrication
    This is just an intermediate step; when the next revision of the parts and maintenance manuals are issued the changes will be included.
    Rob
      
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  • Re: 912s Fuel Pump

    by » 13 years ago

    Hi James,


    http://legacy.rotax-owner.com/si_tb_info/serviceinfo/si-912-020-r5.pdf

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

      
    Report

  • Re: 912s Fuel Pump

    by » 11 years ago

    Bringing this back alive.... My new installed 912ULS has this nipple at the bottom of the factory installed fuel pump. I ran a hose/pipe to the bottom of the cowl away from the exhaust pipes. After 10 hours of running I pulled the lower cowl off for inspection and I see a small amount of OIL leaking from this line. Is this normal?
    Thank you
      
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