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Do I have an Integrated Orifice in My Fuel Block?

in 912 / 914 Technical Questions 3 hours ago

I have a 912ULS, s/n 9144585.  I am trying to determine if I have an integrated orifice in my fuel block or banjo fittings?  I believe I have Fuel Manifold Option 2 (see attached) which shows the orifice inside the fuel block (item 6, highlighted in green).  I've attached a photo of my fuel manifold and banjo bolt assembly.  I don't see a "yellow dot" as mentioned in the Installation Manual, but my top banjo bolt is marked "FUEL".  The bottom line: can I just run a fuel hose back to the tank from the "top" barbed banjo fitting?  I thought I read a few years ago that some were adding a restricting orifice in the line that returns fuel to the tank...

Thanks! 

11001_1_912ULS Fuel Manifold.pdf (You do not have access to download this file.)
11001_1_912ULS Fuel Block.jpg (You do not have access to download this file.)
11001_1_Connection Nipple.pdf (You do not have access to download this file.)

  • Re: Do I have an Integrated Orifice in My Fuel Block?

    by » one hour ago

    Speculation:

    The fuel return line must have a flow restrictor in place to ensure that there is sufficient volume of fuel being delivered, at all times, to the carburettors. Too large a jet and the carburettors may be starved of fuel. Too small a jet may lead to ineffective clearing of fuel vapour. 

    It seems to me that the (Green) Item 6 in the schematic is showing two diffrent the locations of the restrictor (usually a Mikuni #35 jet) depending on how you configure (Options 1 & 2) the Fuel Manifold.

    Option 1 is for a fuel pressure line - Barb #2

    Option 2 is without the fuel pressure line.

    Are you intending to have a fuel pressure read out? If so you will have to go with Option 1 (Barb #2) with the restrictor jet in Barb #5😈

     

      
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