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Thread: New style fuel pump vent line

  1. #1
    Senior Member jrevens's Avatar
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    Default New style fuel pump vent line

    I'm curious how most have run the vent line from the new style Rotax fuel pumps. I was thinking I'd run it back & terminate it somewhere in the air exit area behind the radiator. I'm assuming a Tygon plastic line would be sufficient since it will normally just be air going back & forth unless the pump diaphragm fails.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  2. #2
    Senior Member Dave S's Avatar
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    Default Re: New style fuel pump vent line

    Hi John,

    Installed the new style pump last year for the 5 year rubber replacement. I originally was thinking of the tygon fuel hose; but ended up going with a metal line terminating near the bottom of the firewall out the air duct. Could be just me; but, I considered that the metal line would be free from any possibility of kinking, wouldn't be affected by engine heat and is certainly one less thing under the cowl that could burn/melt.
    Dave S
    Kitfox 7 Trigear (Flying since 2009)
    912ULS Warp Drive

    St Paul, MN

  3. #3
    Super Moderator Av8r3400's Avatar
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    Default Re: New style fuel pump vent line

    I didn't put one on. The old pump didn't have one...
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
    912UL 105hp Zipper
    YouTube Videos

  4. #4
    Senior Member Dusty's Avatar
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    Default Re: New style fuel pump vent line

    The new style pump has a habit of weeping oil out this vent.
    I put a length of Tygon on it with a plug in the end and a couple of vent holes near the pump,
    This gets checked on preflight and emptied as necessary,it is settling down and weeping less now.

  5. #5
    Senior Member PapuaPilot's Avatar
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    Default Re: New style fuel pump vent line

    Tygon will be fine. The Quest Kodiak uses Tygon for most of the vent and drain lines on the PT6 engine. Just keep it away from anything that could melt it.
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

  6. #6
    Senior Member jiott's Avatar
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    Default Re: New style fuel pump vent line

    I used Tygon and ran it back to the air exit behind the radiator.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

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