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Fuel Pressure - Fuel Return Block

in 912iS Technical Questions 4 years ago

I was hoping that someone can identify the manufacturer of - I'm not really sure what to call it - a block with fittings for for fuel in and out, for the return line in and out, and a place to attach the fuel pressure sender. I believe there is an integral restrictor orifice between the fuel pressure side and the return side of the block.

I'm trying to research this thing for my 912iS installation, as it looks like it will save a number of fittings and hose connections. I have a stock number (AC-LLC-269iS) from Lockwood and can probably get the unit there.

I'd appreciate it if anyone could shed light on this particular unit so that I can find technical details.

If you've experience with the unit, that would be nice to hear.

Please see the attachment.

This unit looks clean and I'd like to learn more about it.

Thanks in advance.

 

7986_1_912iS Fuel Return Restrictor Block.png (You do not have access to download this file.)

  • Re: Fuel Pressure - Fuel Return Block

    by » 4 years ago

    This is the first time I have seen that Fuel Manifold (???)

    It looks well made and a Good Idea!

    I suspect that Lockwood produced it as a proprietary part for their AirCam Aircraft and so they will be the sole supplier.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

    Thank you said by: Richard Howell
      
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  • Re: Fuel Pressure - Fuel Return Block

    by » 4 years ago

    Yes Bill - Fuel Manifold sounds like a good term. I’ll be talking to Lockwood to find out more and to see if I can get one.

      
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  • Re: Fuel Pressure - Fuel Return Block

    by » 4 years ago

    Be sure to let us know what you find out!

    If it is reasonably priced, it could become a popular option.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
    Report

  • Re: Fuel Pressure - Fuel Return Block

    by » 4 years ago

    That is very tidy, and has the vapor bypass built right in. I agree Bill, that has to be a Lockwood thing.  

      
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  • Re: Fuel Pressure - Fuel Return Block

    by » 4 years ago

    I have been thinking about it for a day.
    It is very tidy device, but not perfect.
    Let me play the Devils advocate here. surprised
     
    The incoming high pressure fuel need to be below the  return fuel so that any vapor passing the orifice rises into the return flow.
    In this design the flow is uphill but there is no significant space to trap the vapor before it gets pushed downstream to the engine.
    This might not be so bad; as a major vapor-lock would leave the manifold mostly empty and give the orifice an oportunity to do its primary job.  
    Still, I would like to have seen more of a cavity out of the main flow with the orifice at the top to capture smaller vapor bubbles.
     
    The port used to access and install the Orifice is given double duty as the Fuel Pressure port.
    This is a very creative idea but it suffers from one problem;  it places the Fuel pressure sender under the Fuel manifold with the sender mounted upside down.
    The sender is after the coarse filter and fuel pumps but before the fine filter.
    Any small debris that escapes the coarse filter or is generated by the operation and wear of the fuel pumps has the opportunity to drop into the fuel sender in this orentation.  
    Yes, it is being nitpicky and the failure of a pressure sender is only a nuisance issue at best, but the sender manufacturers do instruct to install the sender with the pressure ports facing down.
     
    Goodness!  I have waaay too much time on my hands!!!  wink

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
    Report
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