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Thread: Fuel tank banjo fitting.

  1. #11
    Senior Member jrevens's Avatar
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    Aug 2009
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    Arvada, CO
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    2,146

    Default Re: Fuel tank banjo fitting.

    Quote Originally Posted by jiott View Post
    ...
    I do disagree with your statement that the banjo has very similar flow to a standard elbow. In my hydraulics training we were taught how to calculate pressure drop thru these kind of fittings and it has mostly to do with flow areas and the number of 90 degree bends. A standard elbow has one sharp bend. A banjo has 3 sharp bends. Different brands of banjos have somewhat different flow areas to partially make up for the extra bends. Bottom line, this is all probably just academic and not worth worrying about, but I felt better with a standard elbow.
    Thanks Jim... I don't doubt that you're right. I'm just thinking about a banjo fitting I'm looking at right now... the flow path is through the hollow bolt, then exits through 3 equally spaced holes around the circumference of the bolt into the "banjo chamber" (for lack of a different term). The combined area of those 3 holes exceeds the I.D. of the outlet barb by quite a bit. Also, any one of those 3 holes is probably going to be very close to the inlet of the barb. Some banjo fittings may have only 1 or 2 holes. I don't want to bore anyone, and you're right... it's probably not worth worrying about. I do always appreciate your knowledge of hydraulics.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  2. #12
    Senior Member
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    Dec 2017
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    Mapleton,UT
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    1,224

    Default Re: Fuel tank banjo fitting.

    Anyone know the size on the banjo fittings? Looks like I am going to need to switch my 90 out because I think I have a leak. I have a message to kitfox, but may try and source one local?
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF......FLYING!
    N53TF......FLYING!

  3. #13
    Senior Member
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    Aug 2008
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    Harvard, IL
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    337

    Default Re: Fuel tank banjo fitting.

    For those who have installed the banjo fittings, I'm trying to find out what torque setting you used. I can't find anything specific to these fittings. Found a chart for banjo fittings for brakes which show 95-115 in-lbs with a max of 125. Sound about right? I realize you're just trying to get a good seal on the crush washers but my "feels about right" setting has diminished with my advancing years. Thanks for any help.

    Rick

  4. #14

    Join Date
    Feb 2014
    Location
    Three Lakes, Wi
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    42

    Default Re: Fuel tank banjo fitting.

    In the pictures, it looks like the banjo bolt goes into an adapter that is screwed into the finger screen fitting. Does anyone know what that adapter is and a possible source? Thanks for any responses. - Bob

  5. #15
    Senior Member
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    Harvard, IL
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    Default Re: Fuel tank banjo fitting.

    Bob

    I got everything as a kit from Kitfox. Don't know if they sell individual parts.

    Rick

  6. #16
    Senior Member Cherrybark's Avatar
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    Dec 2015
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    Near Tyler, TX
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    509

    Default Re: Fuel tank banjo fitting.

    Banjo fittings here and Kitfox was perfectly happy to sell them as individual parts. I was concerned about stripping the fuel tank thread while turning a 90 degree fitting "just a little bit more" to have access. Not a concern with the banjos.
    Carl Strange
    Flying
    SS7, 912iS, Oratex, G3X

  7. #17

    Join Date
    Jul 2019
    Location
    Twin Bridges, MT
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    1

    Default Re: Fuel tank banjo fitting.

    Here's a link to purchase appropriate banjo fitting: https://www.ebay.com/itm/171414187984
    And here's a link to AN fittings you might need...free shipping in USA: https://www.anhosefittings.com/?msclkid=957e9ffddd8713e132f6c0a1d50d1b6a&utm_sour ce=bing&utm_medium=cpc&utm_campaign=**LP
    Here's a link to the 5/16 hose barb to 6AN female adapter to complete your banjo install: https://www.anhosefittings.com/straight-push-lock-barbed-an-hose-end-fitting.html

  8. #18

    Join Date
    Feb 2014
    Location
    Three Lakes, Wi
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    42

    Default Re: Fuel tank banjo fitting.

    MTBOB - Thanks for the links. That banjo looks like the ideal fitting.

    Bob

  9. #19

    Join Date
    Jun 2018
    Location
    San Diego, CA
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    75

    Default Re: Fuel tank banjo fitting.

    Quote Originally Posted by MTBob View Post
    Here's a link to purchase appropriate banjo fitting: https://www.ebay.com/itm/171414187984
    And here's a link to AN fittings you might need...free shipping in USA: https://www.anhosefittings.com/?msclkid=957e9ffddd8713e132f6c0a1d50d1b6a&utm_sour ce=bing&utm_medium=cpc&utm_campaign=**LP
    Here's a link to the 5/16 hose barb to 6AN female adapter to complete your banjo install: https://www.anhosefittings.com/straight-push-lock-barbed-an-hose-end-fitting.html
    Those fitting look awesome. I ordered a pair. I'll report back when I get them.
    Mike
    Building the JaMFox N677JM
    Kitfox 5 Vixen
    KRNM

  10. #20
    Senior Member
    Join Date
    Apr 2010
    Location
    Bryan, Texas
    Posts
    558

    Default Re: Fuel tank banjo fitting.

    Fabricated some banjo fuel connections in case anyone is interested.

    I used a AN 1/4" to 1/8" reducer. The tap is a M10x1.

    The tap calls for a 9mm drill. I found that just running the tap in the 1/8" threads worked better. Just make sure the tap stays straight.

    I already had the AN reducers. The tap was $8, and the 10 MM banjos with bolt and crush washers were $6.50 each.

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    https://www.aircraftspruce.com/catal...ages/an912.php

    I found that running a 3/8" NPT tap in the tank a little deeper helped to get the strainers farther in and make more room.

    banjo 1.jpg
    banjo 2.jpg
    banjo 3.jpg

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